Revise paste Untitled

#include <iostream>
using namespace std;
int a[200005];
int pref_sum[200005];
int sum(int i, int j) {
    if(i == 0) {
        return pref_sum[j];
    }
    return pref_sum[j] - pref_sum[i - 1];
}
int main() {
    int n, k;
    cin >> n >> k;
    int s = 0;
    for(int i = 0; i < n; i++) {
        cin >> a[i];
        a[i] = 1 - a[i];
        s += a[i];
        pref_sum[i] = s;
    }
    int ret = 0, si, ei;
    for(int i = 0; i < n; i++) {
        int L = i + 1;
        int R = n - 1;
        while(L <= R) {
            int middle = (L + R) / 2;
            if(sum(i, middle) <= k) {
                if(ret < middle - i + 1) {
                    ret = middle - i + 1;
                    si = i;
                    ei = middle;
                }
                L = middle + 1;
            }
            else {
                R = middle - 1;
            }
        }
    }
    cout << ret << endl;
    for(int i = si; i <= ei; i++) {
        if(a[i] == 1) {
            cout << i + 1 << " ";
        }
    }
    return 0;
}
// 1 2 3 4 5
// a --> b imame tocno b - a + 1