题解 | #尼科彻斯定理#
尼科彻斯定理
http://www.nowcoder.com/practice/dbace3a5b3c4480e86ee3277f3fe1e85
#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
int first;
while (cin >> n) {
first = n*n - n + 1;
cout << first;
for (int i = 1; i < n; ++i) {
cout << "+" << first + i * 2;
}
cout << endl;
}
return 0;
} 
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