# 参考https://www.acwing.com/solution/content/3600/ #include<stdio.h> int main(int x,int y,int ans){ ans=0; scanf("%d%d",&x,&y); for(int i=(x<y?x:y)+1;i<(x>y?x:y);i++) if(i&1) ans+=i; printf("%d",ans); }