【C】#牛牛学数列4#
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
#include <stdio.h>
int main() {
int n, sum = 0, tmp = 0;
scanf("%d", &n);
for (int i = 1; i <= n; i++) {
tmp += i;
sum += tmp;
}
printf("%d", sum);
return 0;
}
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