what does this means:[Warning] pointer to a function used in arithmetic [-Wpointer-arith]Im trying to solve a problem and this appears everytime

Question

#include using namespace std; long long brr(long long niz[10][10], long long x, long long y, long long n){ long long br=0; for(long long i=x;i<=n;--i){ if(niz[i][y]!=1){ ++br