Compilare: user.cpp: In function ‘int main()’: user.cpp:20:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(maxim<s-a[i]-a[i-1]-a[i-2]+a[i]*a[i-1]*a[i-2]) maxim=s-a[i]-a[i-1]-a[i-2]+a[i]*a[i-1]*a[i-2]; ^ user.cpp:27:70: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(maxim<s-a[i]-a[i-1]-a[j]-a[j-1]+a[i]*a[i-1]+a[j]*a[j-1]) maxim=s-a[i]-a[i-1]-a[j]-a[j-1]+a[i]*a[i-1]+a[j]*a[j-1]; ^ user.cpp:11:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:14:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a[i]); ^