题解 | #小乐乐求和#
小乐乐求和
https://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
#include <stdio.h>
int main()
{
    long long n;
    scanf("%lld",&n);
    printf("%lld",(1+n)*n/2);
    return 0;
}
小乐乐求和
https://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
#include <stdio.h>
int main()
{
    long long n;
    scanf("%lld",&n);
    printf("%lld",(1+n)*n/2);
    return 0;
}
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