题解 | #整数拆分#

#include <bits/stdc++.h>
#define MAX 1000000
using namespace std;


int main() {
    int n;
    int dp[MAX];
    while (cin >> n) {
        memset(dp, 0, sizeof(dp));
        dp[0] = 1;

        for (int i = 1; i <= n; i *= 2) {
            for (int j = i; j <= n; j++) {
                dp[j] = (dp[j] + dp[j - i]) % 1000000000;  //不取+取
            }
        }
        cout << dp[n] % 1000000000 << endl;
    }
}