注解
1、公式推导:f(n) = 6 * (n-1) + f(n-1),f(1) = 2
2、详解:https://blog.csdn.net/pmt123456/article/details/53939004
代码
#include <iostream>
using namespace std;
const int LEN = 10001;
int a[LEN];
void init(){
a[1] = 2;
for(int i=2; i<LEN; i++){
a[i] = 3*(i-1)*2 + a[i-1];
}
}
int main() {
init();
int T;
scanf("%d", &T);
for(int i=0; i<T; i++){
int m;
scanf("%d", &m);
printf("%d\n", a[m]);
}
return 0;
}