Compilare: main.cpp: In function 'void bfs(int)': main.cpp:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i=0;i<p[k].size();i++ ) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:41:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "darb.in", "r", stdin ); ^ main.cpp:42:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "darb.out", "w", stdout ); ^ main.cpp:46:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &n ); ^ main.cpp:50:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &a, &b ); ^