bzoj1432: [ZJOI2009]Function

找规律

#include <iostream>#include <algorithm>#include <cstring>#include <cstdio>#include <cmath>using namespace std;int n,k;int main(){    int ans;    scanf("%d%d",&n,&k);    if(n==1)    {        ans=1;    }    else    {        ans=min(k,n-k+1)*2;    }    printf("%d\n",ans);    return 0;}