Compilare: user.cpp: In function ‘int getl(int)’: user.cpp:81:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( v.size ( ) == -1 ) { return 0 ; } ~~~~~~~~~~~^~~~~ user.cpp: In function ‘int main()’: user.cpp:137:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "election.in" , "r" , stdin ) ; ^ user.cpp:138:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "election.out" , "w" , stdout ) ; ^