题解 | 小乐乐求和
小乐乐求和
https://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
#include <iostream>
using namespace std;
int main() {
long n;
scanf("%Ld", &n);
printf("%Ld", n * (n + 1) / 2);
}
小乐乐求和
https://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
#include <iostream>
using namespace std;
int main() {
long n;
scanf("%Ld", &n);
printf("%Ld", n * (n + 1) / 2);
}
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