Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:30:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[Q[i]].size();j++){ ^ user.cpp: In function ‘void goin(int)’: user.cpp:45:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[Q[i]].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:61:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(iN); ^ user.cpp:62:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(ouT); ^ user.cpp:63:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:64:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=n;i++) scanf("%d",&t[i]); ^ user.cpp:66:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m); ^ user.cpp:68:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^