穿越时空之门 参考代码

#include <bits/stdc++.h>
using namespace std;

typedef long long LL;
const int maxn = 100 + 100;
int ans;

int cal(int x, int p) {
    int ret = 0;
    while (x != 0) {
        ret += x % p;
        x /= p;
    }
    return ret;
}

int main() {
#ifdef ExRoc
    freopen("test.txt", "r", stdin);
#endif // ExRoc
    ios::sync_with_stdio(false);

    for (int i = 1; i <= 2024; ++i) {
        if (cal(i, 2) == cal(i, 4)) {
            ++ans;
        }
    }
    cout << ans << endl;

    return 0;
}