Compilare: main.cpp: In function 'int BFS(int, int)': main.cpp:31:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < V[ nod ].size(); ++i ) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:66:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < V[ n ].size(); ++i ) { ~~^~~~~~~~~~~~~~~ main.cpp:51:15: warning: unused variable 'i' [-Wunused-variable] int n, m, i, x, y, c; ^ main.cpp:48:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "maxflow.in", "r", stdin ); ^ main.cpp:49:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "maxflow.out", "w", stdout ); ^ main.cpp:53:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &n,&m ); ^ main.cpp:55:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d%d", &x,&y,&c ); ^