CodeForces 645B Mischievous Mess Makers
简单题。
第一次交换$1$和$n$,第二次交换$2$和$n-1$,第三次交换$3$和$n-2$.....计算一下就可以了。
#pragma comment(linker, "/STACK:1024000000,1024000000") #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<vector> #include<map> #include<set> #include<queue> #include<stack> #include<iostream> using namespace std; typedef long long LL; ; void File() { freopen("D:\\in.txt","r",stdin); freopen("D:\\out.txt","w",stdout); } template <class T> inline void read(T &x) { ; while(!isdigit(c)) c=getchar(); +c-'; c=getchar();} } int n,k; int main() { scanf("%d%d",&n,&k); ) k=n/; LL ans=; int num=n; ;i<=k;i++) { ans=ans+num-+num-; num=num-; } printf("%lld\n",ans); ; }
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