Compilare: user.cpp: In function ‘int main()’: user.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=m;i++) ^ user.cpp:18:22: warning: integer overflow in expression [-Woverflow] min1=(1<<31)-1; ^ user.cpp:19:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<=n; j++) ^ user.cpp:33:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<=n; j++) ^ user.cpp:39:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<=n; j++) ^