Compilare: main.cpp: In function 'int main()': main.cpp:28:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v [top].size () ; ++ i){ ~~^~~~~~~~~~~~~~~~~ main.cpp:9:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("berarii2.in" , "r" , stdin); ^ main.cpp:10:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("berarii2.out" , "w" , stdout); ^ main.cpp:12:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d" , &n , &m , &p); ^