Compilare: main.cpp: In function 'int main()': main.cpp:63:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < vp.size() ; ++i) ~~^~~~~~~~~~~ main.cpp:21:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sormin.in" , "r" , stdin) ; ^ main.cpp:22:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sormin.out" , "w" , stdout) ; ^