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