Compilare: user.cpp: In function ‘int main()’: user.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<n; i++) ^ user.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<m; j++) ^ user.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<m;j++) ^ user.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;i++) ^ user.cpp:43:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k>=NR_MAX) ^ user.cpp:47:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p=0;p<NR_MAX;p++) ^ user.cpp:54:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m;i++) ^ user.cpp:65:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=a[i][0].nr;j++) ^ user.cpp:75:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m;i++) ^