题解 | #小乐乐计算求和#
小乐乐计算求和
https://www.nowcoder.com/practice/c98aeab2362c459dbc840d4c75f07729
#include<stdio.h>
int f(int n) {
return n == 1 ? 1 : n * f(n - 1);
}
int main(void) {
int n;
scanf("%d", &n);
int sum = 0;
for (int i = 1; i <= n; i++)
sum += f(i);
printf("%d", sum);
return 0;
}
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