Compilare: main.cpp: In function 'int bfs()': main.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < G[u].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int max_flow()': main.cpp:64:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < G[t].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp:62:34: warning: unused variable 'fl' [-Wunused-variable] int i , j , nod , flow = 0 , fl; ^~ main.cpp: In function 'int main()': main.cpp:78:40: 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:79:42: 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:81:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &n , &m); ^ main.cpp:84:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d" , &x , &y , &z); ^