Compilare: main.cpp: In function 'int del(int, int)': main.cpp:21:14: warning: no return statement in function returning non-void [-Wreturn-type] q.push(it);}}} ^ main.cpp: In function 'int main()': main.cpp:23:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ps.in","r",stdin); ^ main.cpp:24:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ps.out","w",stdout); ^ main.cpp:26:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&k); ^ main.cpp:28:57: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&s,&p),g[p].push_back(s),g2[s].push_back(p); ^