Compilare: user.cpp: In function ‘int main()’: user.cpp:25:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<chei[nod].size();i++) ^ user.cpp:34:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(i+lin[k]>=0&&i+lin[k]<n&&j+col[k]>=0&&j+col[k]<m&&viz[i+lin[k]][j+col[k]]==0) ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("castel.in","r",stdin); ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("castel.out","w",stdout); ^ user.cpp:12:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&k); ^ user.cpp:15:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^