java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AbstractInterpretationCInline.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Camel+AI_EQ.epf -i ../../../trunk/examples/svcomp/reducercommutativity/sum_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d63d1fb [2018-01-28 00:44:52,944 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-28 00:44:52,947 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-28 00:44:52,972 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-28 00:44:52,973 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-28 00:44:52,974 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-28 00:44:52,976 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-28 00:44:52,979 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-28 00:44:52,981 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-28 00:44:52,981 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-28 00:44:52,994 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-28 00:44:52,994 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-28 00:44:52,995 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-28 00:44:52,996 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-28 00:44:52,997 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-28 00:44:52,999 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-28 00:44:53,001 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-28 00:44:53,007 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-28 00:44:53,008 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-28 00:44:53,009 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-28 00:44:53,014 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-28 00:44:53,021 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Camel+AI_EQ.epf [2018-01-28 00:44:53,036 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-28 00:44:53,036 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-28 00:44:53,037 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-28 00:44:53,037 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-28 00:44:53,037 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-28 00:44:53,037 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-28 00:44:53,037 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-28 00:44:53,039 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-28 00:44:53,040 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-28 00:44:53,040 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-28 00:44:53,040 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-28 00:44:53,040 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-28 00:44:53,040 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-28 00:44:53,041 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-28 00:44:53,041 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-28 00:44:53,041 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-28 00:44:53,041 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-28 00:44:53,041 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-28 00:44:53,041 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-28 00:44:53,042 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-28 00:44:53,042 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-28 00:44:53,042 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-28 00:44:53,042 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-28 00:44:53,042 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-28 00:44:53,043 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-28 00:44:53,043 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-28 00:44:53,044 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-28 00:44:53,044 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-28 00:44:53,044 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-28 00:44:53,045 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-28 00:44:53,045 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-28 00:44:53,045 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-01-28 00:44:53,045 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-28 00:44:53,045 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-28 00:44:53,046 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-28 00:44:53,046 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-28 00:44:53,047 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-28 00:44:53,098 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-28 00:44:53,112 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-28 00:44:53,116 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-28 00:44:53,117 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-28 00:44:53,118 INFO L276 PluginConnector]: CDTParser initialized [2018-01-28 00:44:53,119 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/reducercommutativity/sum_true-unreach-call_true-termination.i [2018-01-28 00:44:53,270 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-28 00:44:53,278 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-01-28 00:44:53,279 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-28 00:44:53,279 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-28 00:44:53,286 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-28 00:44:53,288 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,292 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@377f78c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53, skipping insertion in model container [2018-01-28 00:44:53,292 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,311 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-28 00:44:53,332 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-28 00:44:53,485 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-28 00:44:53,509 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-28 00:44:53,518 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53 WrapperNode [2018-01-28 00:44:53,518 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-28 00:44:53,522 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-01-28 00:44:53,522 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-01-28 00:44:53,522 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-01-28 00:44:53,533 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,546 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,569 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-01-28 00:44:53,570 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-28 00:44:53,570 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-28 00:44:53,570 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-28 00:44:53,580 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,580 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,586 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,587 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,598 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,607 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,609 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53" (1/1) ... [2018-01-28 00:44:53,610 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-28 00:44:53,611 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-28 00:44:53,611 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-28 00:44:53,611 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-28 00:44:53,612 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.01 12:44:53" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-28 00:44:53,693 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-28 00:44:53,693 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-28 00:44:53,693 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-28 00:44:53,693 INFO L128 BoogieDeclarations]: Found specification of procedure sum [2018-01-28 00:44:53,693 INFO L136 BoogieDeclarations]: Found implementation of procedure sum [2018-01-28 00:44:53,694 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-28 00:44:54,164 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-28 00:44:54,165 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.01 12:44:54 BoogieIcfgContainer [2018-01-28 00:44:54,165 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-28 00:44:54,165 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2018-01-28 00:44:54,166 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2018-01-28 00:44:54,166 INFO L276 PluginConnector]: Abstract Interpretation initialized [2018-01-28 00:44:54,167 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.01 12:44:54" (1/1) ... [2018-01-28 00:44:54,215 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-28 00:44:56,711 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-28 00:44:56,724 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-28 00:44:56,731 INFO L268 AbstractInterpreter]: Visited 50 different actions 152 times. Merged at 24 different actions 53 times. Never widened. Found 9 fixpoints after 5 different actions. Largest state had 40 variables. [2018-01-28 00:44:56,733 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2018-01-28 00:44:56,735 INFO L168 Benchmark]: Toolchain (without parser) took 3463.45 ms. Allocated memory was 308.3 MB in the beginning and 392.2 MB in the end (delta: 83.9 MB). Free memory was 269.0 MB in the beginning and 184.9 MB in the end (delta: 84.1 MB). Peak memory consumption was 168.0 MB. Max. memory is 5.3 GB. [2018-01-28 00:44:56,736 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 308.3 MB. Free memory is still 273.0 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-28 00:44:56,736 INFO L168 Benchmark]: CACSL2BoogieTranslator took 239.57 ms. Allocated memory is still 308.3 MB. Free memory was 267.0 MB in the beginning and 259.0 MB in the end (delta: 8.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 5.3 GB. [2018-01-28 00:44:56,737 INFO L168 Benchmark]: Boogie Procedure Inliner took 47.99 ms. Allocated memory is still 308.3 MB. Free memory was 259.0 MB in the beginning and 257.0 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-28 00:44:56,737 INFO L168 Benchmark]: Boogie Preprocessor took 40.73 ms. Allocated memory is still 308.3 MB. Free memory is still 257.0 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-28 00:44:56,737 INFO L168 Benchmark]: RCFGBuilder took 554.09 ms. Allocated memory is still 308.3 MB. Free memory was 257.0 MB in the beginning and 238.1 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 5.3 GB. [2018-01-28 00:44:56,738 INFO L168 Benchmark]: Abstract Interpretation took 2567.59 ms. Allocated memory was 308.3 MB in the beginning and 392.2 MB in the end (delta: 83.9 MB). Free memory was 238.1 MB in the beginning and 184.9 MB in the end (delta: 53.2 MB). Peak memory consumption was 137.1 MB. Max. memory is 5.3 GB. [2018-01-28 00:44:56,754 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 308.3 MB. Free memory is still 273.0 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 239.57 ms. Allocated memory is still 308.3 MB. Free memory was 267.0 MB in the beginning and 259.0 MB in the end (delta: 8.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 5.3 GB. * Boogie Procedure Inliner took 47.99 ms. Allocated memory is still 308.3 MB. Free memory was 259.0 MB in the beginning and 257.0 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 40.73 ms. Allocated memory is still 308.3 MB. Free memory is still 257.0 MB. There was no memory consumed. Max. memory is 5.3 GB. * RCFGBuilder took 554.09 ms. Allocated memory is still 308.3 MB. Free memory was 257.0 MB in the beginning and 238.1 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 5.3 GB. * Abstract Interpretation took 2567.59 ms. Allocated memory was 308.3 MB in the beginning and 392.2 MB in the end (delta: 83.9 MB). Free memory was 238.1 MB in the beginning and 184.9 MB in the end (delta: 53.2 MB). Peak memory consumption was 137.1 MB. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 40 LocStat_MAX_WEQGRAPH_SIZE : 2 LocStat_MAX_SIZEOF_WEQEDGELABEL : 1 LocStat_NO_SUPPORTING_EQUALITIES : 495 LocStat_NO_SUPPORTING_DISEQUALITIES : 57 LocStat_NO_DISJUNCTIONS : -80 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 52 TransStat_MAX_WEQGRAPH_SIZE : 2 TransStat_MAX_SIZEOF_WEQEDGELABEL : 1 TransStat_NO_SUPPORTING_EQUALITIES : 61 TransStat_NO_SUPPORTING_DISEQUALITIES : 5 TransStat_NO_DISJUNCTIONS : 48 TransStat_MAX_NO_DISJUNCTIONS : 1 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 11.247014 RENAME_VARIABLES(MILLISECONDS) : 1.839557 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 11.181375 PROJECTAWAY(MILLISECONDS) : 0.324129 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.071786 DISJOIN(MILLISECONDS) : 0.254886 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 1.886974 ADD_EQUALITY(MILLISECONDS) : 0.017234 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.016316 #CONJOIN_DISJUNCTIVE : 180 #RENAME_VARIABLES : 336 #UNFREEZE : 0 #CONJOIN : 221 #PROJECTAWAY : 221 #ADD_WEAK_EQUALITY : 12 #DISJOIN : 32 #RENAME_VARIABLES_DISJUNCTIVE : 356 #ADD_EQUALITY : 65 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 4 - UnprovableResult [Line: 1]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: abstract domain could reach this error location. Possible FailurePath: [L4] int N; - UnprovableResult [Line: 1]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: abstract domain could reach this error location. Possible FailurePath: [L4] int N; [L19] EXPR N = __VERIFIER_nondet_int() [L20] COND FALSE, EXPR !(N > 1) [L42] return 1; [L17-L43] int main () { N = __VERIFIER_nondet_int(); if (N > 1) { int x[N]; int temp; int ret; int ret2; int ret5; ret = sum(x); temp=x[0];x[0] = x[1]; x[1] = temp; ret2 = sum(x); temp=x[0]; for(int i =0 ; i