题解 | #牛牛学数列#
牛牛学数列
http://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
#include <stdio.h> int main(){ int n; int sum=0; scanf("%d",&n); for(int i=1;i<n+1;i++){ if(i%2==0)sum-=i; else sum+=i; } printf("%d",sum); return 0; }
牛牛学数列
http://www.nowcoder.com/practice/0b97367cd2184c12a0e02f7c223aee11
#include <stdio.h> int main(){ int n; int sum=0; scanf("%d",&n); for(int i=1;i<n+1;i++){ if(i%2==0)sum-=i; else sum+=i; } printf("%d",sum); return 0; }
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