加油 B4310 之上的题目尽量完成

B4310

// 两个余数相同的数相减一定能被K整除
#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 10;
int a[N];
int n, k, len = -1, l, r, sum;
map<int, int >mp;
int main() {
    cin >> n >> k;
    mp[0] = 0;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        sum = (sum + a[i]) % k;
        if (!mp.count(sum))
            mp[sum] = i;
        else if (i - mp[sum] >= len) {
            len = i - mp[sum] ;
            l = mp[sum] + 1, r = i;
        }
    }
    cout << len << endl;
    for (int i = l; i <= r && len != -1 ; i++)
        cout << a[i] << " ";
    return 0;
}