Compilare: user.cpp: In function ‘void Trans(long int, long int, long int, long int)’: user.cpp:24:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<v[sx][sy].size();i++) v[dx][dy].pb(v[sx][sy][i]); ^ user.cpp: In function ‘void Comp(long int, long int, long int)’: user.cpp:27:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<v[sx][sy].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:110:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(p=0;p<v[i][j].size();p++){ ^ user.cpp:111:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p==v[i][j].size()-1){ ^ user.cpp:95:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("go2.in","r",stdin); ^ user.cpp:96:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("go2.out","w",stdout); ^ user.cpp:98:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld\n",&n,&m); ^ user.cpp:99:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=n;i++) scanf("%s\n",a[i]+1); ^