题解分享
题解分享简介
平方序列（结果填空） - 题解
```cpp
#include <string>
#include <iostream>
#include <vector>
using namespace std;
using ll = long long;
int main() {
vector<ll> arr(10000);
for (int i = 0, x = 2020; i < arr.size(); ++i, ++x)
arr[i] = x * x;
ll minn = 1e18;
for (int i = 0; i < arr.size(); ++i) {
for (int j = i + 1; j < arr.size(); ++j) {
if (arr[j] == arr[i] * 2 - 2019 * 2019)
minn = min(minn, i + 2020LL * 2LL + j);
}
}
cout << minn;
return 0;
}
```
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