HDU 2050 折线分割平面 -

题目地址：http://acm.hdu.edu.cn/showproblem.php?pid=2050

待定系数直接求出公式了

ax^2+bx+c

得

2*x*x-x+1

#include <iostream>#include <cstdio>#include <algorithm>#include <cstring>#include <cctype>#include <cmath>#include <sstream>#include <vector>using namespace std;#define REP(i,a,b) for(int i=a;i<(int)b;i++)#define REPD(i,a,b) for(int i=a;i>=(int)b;i--)int main(){int T,n; scanf("%d",&T);while(T--&&scanf("%d",&n)==1){printf("%d\n", 2*n*n-n+1);}return 0;}