Compilare: user.cpp: In function ‘int main()’: user.cpp:12:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<m;i++) ^ user.cpp:13:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<n;j++) ^ user.cpp:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<n;i++) ^ user.cpp:18:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<m-1;i++) ^ user.cpp:27:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=2;j<n;j++) ^ user.cpp:28:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[i][j]<min1) ^ user.cpp:33:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[i][j]<min2) ^ user.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<n;j++) ^ user.cpp:44:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<n;i++) ^ user.cpp:45:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[m-1][i]<min1) ^ user.cpp:11:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&m,&n); ^ user.cpp:14:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[i][j]); ^