Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:14:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int co=0;co<v[nod].size();co++) ^ user.cpp: In function ‘void dfs1(int)’: user.cpp:32:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int co=0;co<v1[nod].size();co++) ^ user.cpp: In function ‘int verif(int, int)’: user.cpp:44:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void back(int)’: user.cpp:57:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:70:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<r[vcc[qwq].lin].size();i++) ^ user.cpp:53:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(pp1==0) ^ user.cpp: In function ‘int main()’: user.cpp:111:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r[vcc[i].lin].size()>maxim) ^ user.cpp:82:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare.in","r",stdin); ^ user.cpp:83:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare.out","w",stdout); ^ user.cpp:84:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:91:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^