Compilare: user.cpp: In function ‘int main()’: user.cpp:30:27: 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:34:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^ user.cpp:45:9: warning: ‘efmn’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (ef<efmn) {efmn=ef;cm=c;culm=i;} ^