想问一下各位大佬哪里有问题，输出为灰色的

#include<iostream>
using namespace std;
int main() {
	int w, x, h,q,i,j,k,v,qr;
	int x1, y1, x2, y2, z1, z2;
	int count = 0;
	int arr[21][21][21] = {0};
	cin >> w >> x >> h;
	v = w * x * h;
	cin >> q;
	for ( qr= 0; qr < q; i++) {
		cin >> x1 >> y1 >> z1>>x2>>y2>>z2;
		for (i = x1; i <= x2; i++) {
			for (j = y1; j <= y2; j++) {
				for (k = z1; k <= z2; k++) {
					arr[i][j][k] = { 1 };
				}
			}
		}
	}
	for (i = 1; i <= w; i++) {
		for (j = 1; j <= x; j++) {
			for (k = 1; k <= h; k++) {
				if (arr[i][j][k] == 1) {
					count++;
				}
			}
		}
	}
	cout << v - count;
	return 0;
}