【hihocoder 1296】数论三·约瑟夫问题

【题目链接】:http://hihocoder.com/problemset/problem/1296

【题意】

【题解】















【Number Of WA】



0



【完整代码】

#include <bits/stdc++.h>
using namespace std;
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define LL long long
#define rep1(i,a,b) for (int i = a;i <= b;i++)
#define rep2(i,a,b) for (int i = a;i >= b;i--)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define ms(x,y) memset(x,y,sizeof x)

typedef pair<int,int> pii;
typedef pair<LL,LL> pll;

const int dx[9] = {0,1,-1,0,0,-1,-1,1,1};
const int dy[9] = {0,0,0,-1,1,-1,1,-1,1};
const double pi = acos(-1.0);
const int N = 110;

int t,n,k;

int ysf(int n,int k)
{
    if (n==1)
        return 0;
    if (n<k)
    {
        int ret = 0;
        rep1(i,2,n)
            ret = (ret+k)%i;
        return ret;
    }
    int ret = ysf(n-n/k,k);
    if (ret<n%k)
        ret = ret-n%k+n;
    else
        ret = ret-n%k+(ret-n%k)/(k-1);
    return ret;
}

int main()
{
    //freopen("F:\\rush.txt","r",stdin);
    ios::sync_with_stdio(false),cin.tie(0);//scanf,puts,printf not use
    cin >> t;
    while (t--)
    {
        cin >> n >> k;
        cout <<ysf(n,k)<<endl;
    }
    return 0;
}