Compilare: user.cpp: In function ‘int main()’: user.cpp:38:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[i][j]<min1) ^ user.cpp:44:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(b[i][j]<min2) min2=b[i][j]; ^ user.cpp:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[m-1][j]<min1) min1=b[m-1][j]; ^ user.cpp:12:29: 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:16:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%u",&z); ^