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Poj2886Who Gets the Most Candies?线段树

2024-07-18 20:49:18   215人阅读

约瑟夫环用线段数搞，一脸搞不出来的样子。反素数，太神了，先打表，然后就可以 O(1)找到因子数最多的。ps：哎。这题也是看着题解撸的。

#include <cstdio>#include <cstring>#include <algorithm>#include <climits>#include <string>#include <iostream>#include <map>#include <cstdlib>#include <list>#include <set>#include <queue>#include <stack>#include<math.h>using namespace std;#define lson l,mid,rt<<1#define rson mid+1,r,rt<<1|1int k;int sum[2222222];int chart[35][2] = { 498960, 200, 332640, 192, 277200, 180, 221760, 168, 166320, 160, 110880, 144, 83160, 128, 55440, 120, 50400, 108, 45360, 100, 27720, 96, 25200, 90, 20160, 84, 15120, 80, 10080, 72, 7560, 64, 5040, 60, 2520, 48, 1680, 40, 1260, 36, 840, 32, 720, 30, 360, 24, 240, 20, 180, 18, 120, 16, 60, 12, 48, 10, 36, 9, 24, 8, 12, 6, 6, 4, 4, 3, 2, 2, 1, 1 };void up(int rt){    sum[rt] = sum[rt << 1] + sum[rt << 1 | 1];}void build(int l, int r, int rt){    if (l == r){        sum[rt] = 1; return;    }    int mid = (l + r) >> 1;    build(lson);    build(rson);    up(rt);}void update(int key, int l, int r, int rt){    if (l == r){        sum[rt] = 0; k = l; return;    }    int mid = (l + r) >> 1;    if (key <= sum[rt << 1]) update(key, lson);    else update(key - sum[rt << 1], rson);    up(rt);}int ask(int L, int R, int l, int r, int rt){    if (L <= l&&r <= R) return sum[rt];    int ans = 0;    int mid = (l + r) >> 1;    if (L <= mid) ans += ask(L, R, lson);    if (R>mid) ans += ask(L, R, rson);    return ans;}char str[555555][11];int a[555555];int main(){    int n;    while (scanf("%d%d", &n, &k) != EOF){        int cnt = 0;        while (n<chart[cnt][0]) cnt++;        int t = chart[cnt][0];        for (int i = 1; i <= n; i++){            scanf("%s%d", str[i], &a[i]);        }        build(1, n, 1);        int m = n; int now = k;        for (int i = 0; i<t - 1; i++){            update(now, 1, n, 1);            m--;            if (a[k] % m == 0){                if (a[k]>0) a[k] = m;                else a[k] = 1;            }            else{                a[k] %= m; if (a[k]<0) a[k] += m + 1;            }            int cc = ask(1, k, 1, n, 1);            int tt = m - cc;            if (a[k] <= tt) now = a[k] + cc;            else now = a[k] - tt;        }        update(now, 1, n, 1);//m 最后为0        printf("%s %d\n", str[k], chart[cnt][1]);    }    return 0;}

 


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