Compilare: user.cpp: In function ‘bool OK(int, int, int)’: user.cpp:19:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i+dy[k]>=0 && i+dy[k]<n && j+dx[k]>=0 && j+dx[k]<m && a[i+dy[k]][j+dx[k]]<h)return true; ^ user.cpp:19:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i+dy[k]>=0 && i+dy[k]<n && j+dx[k]>=0 && j+dx[k]<m && a[i+dy[k]][j+dx[k]]<h)return true; ^ user.cpp: In function ‘int main()’: user.cpp:26:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<n;++i)for(j=0;j<m;++j) ^ user.cpp:26:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<n;++i)for(j=0;j<m;++j) ^