Compilare: user.cpp: In function ‘int main()’: user.cpp:43:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[i][j]<min1) ^ user.cpp:49:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(b[i][j]<min2) min2=b[i][j]; ^ user.cpp:59:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[m-1][j]<min1) min1=b[m-1][j]; ^ user.cpp:10:39: warning: unused variable ‘z’ [-Wunused-variable] unsigned int m,n,i,j,min1,min2,jmin,z; ^ user.cpp:13:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%u %u", &m, &n); ^ user.cpp:18:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%u",&a[i][j]); ^