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