code. compile. run. debug. share.
#include <bits/stdc++.h>
using namespace std;
const int MAX = 1e6;
int main()
{
#ifdef _DEBUG
freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
#endif
int n;
cin >> n;
vector<int> a(n);
vector<int> cnt(MAX + 1);
for (int i = 0; i < n; ++i)
{
cin >> a[i];
++cnt[a[i]];
}
long long sum = accumulate(a.begin(), a.end(), 0ll);
vector<int> ans;
for (int i = 0; i < n; ++i)
{
sum -= a[i];
--cnt[a[i]];
if (sum % 2 == 0 && sum / 2 <= MAX && cnt[sum / 2] > 0)
{
ans.push_back(i);
}
sum += a[i];
++cnt[a[i]];
}
cout << ans.size() << endl;
for (auto it : ans)
cout << it + 1 << " ";
cout << endl;
return 0;
}
Compiling Program...
Standard Input:
Interactive Console
Text
Program is not being debugged. Click "Debug" button to start program in debug mode.
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