Compilare: user.cpp: In function ‘void Dijkstra()’: user.cpp:38:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0;j < G[i].size();j++){ ^ user.cpp: In function ‘void BFS()’: user.cpp:63:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0;i < G[x].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:92:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dmin.in","r",stdin); ^ user.cpp:93:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dmin.out","w",stdout); ^ user.cpp:95:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ",&N,&M); ^ user.cpp:99:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %lf ",&x,&y,&z); ^