Compilare: main.cpp: In function 'int main()': main.cpp:79:7: warning: this 'else' clause does not guard... [-Wmisleading-indentation] else ^~~~ main.cpp:86:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else' if(ok==1) ^~ main.cpp:10:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pipe.in","r",stdin); ^ main.cpp:11:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pipe.out","w",stdout); ^