题解 | [NOIP2015]金币
[NOIP2015]金币
https://www.nowcoder.com/practice/8f71f5670e6a45118d24d13868a2da9e
#include <stdio.h>
#include <math.h>
int main() {
int n,sum_days,sum=0;
scanf("%d",&n);
int i=1;
while((i*i+i)/2<=n){
i++;
}
sum_days = i-1;
for(int j=0;j<sum_days;j++){
sum +=(j+1)*(j+1);
}
sum = sum +i*(n-(i*i-i)/2);
printf("%d\n",sum);
return 0;
}
查看24道真题和解析
