Compilare: user.cpp: In function ‘int main()’: user.cpp:33:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s1 > smax) ^ user.cpp:14:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:17:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&ma[i][j]); ^