help，为什么错了，感觉没问题啊。

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

int a[200010], b[200010];
int cnt[1000010];
signed main() {
    ios::sync_with_stdio(false);
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    int n, sum = 0;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        b[i] = a[i];
    }
    sort(a + 1, a + 1 + n);
    int m = unique(a + 1, a + 1 + n) - a - 1;
    for (int i = m; i >= 1; i--) {
        cnt[a[i]] = sum;
        sum += a[i];
    }
    for (int i = 1; i <= n; i++) {
        cout << cnt[b[i]] << ' ';
    }
    return 0;
}