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  • poj 2886 Who Gets the Most Candies?

    题意:约瑟夫环游戏,第 p个出来的人有F(p)(求p的反素数)个糖果,问糖果最多的人的名字和它有多少个糖果,如果最多的有几个人,输出最先出来的那个人

    解题思路:这个题目有很多细节要注意,首先,顺时针的话大的是在他的左边,然后就是要注意它的步数是否是大于人数的,利用线段树的基本性质搜索它的位置就行了

    解题代码:

      1 #include <stdlib.h>
      2 #include <string.h>
      3 #include <stdio.h>
      4 #define MAXN 500005
      5 int n, k ;
      6 int a[MAXN];
      7 struct node
      8 {
      9     int left ,right ,mid ;
     10     int num ;
     11 }tree[MAXN * 4];
     12 int L(int c)
     13 {
     14     return 2 * c;
     15 }
     16 int R(int c)
     17 {
     18     return 2 * c + 1;
     19 }
     20 void build(int c, int p , int v)
     21 {
     22     tree[c].left = p ;
     23     tree[c].right = v;
     24     tree[c].mid = (p+v)/2;
     25     tree[c].num = (v-p+1);
     26     if(p == v )
     27     {
     28         return;
     29     }
     30     build(L(c),p,tree[c].mid);
     31     build(R(c),tree[c].mid + 1, v);
     32 }
     33 int tsum = 0  ;
     34 void getsum(int c, int p ,int v )
     35 {
     36     if(p <= tree[c].left && v >= tree[c].right)
     37     {
     38         tsum += tree[c].num;
     39         return;
     40     }
     41     if(v <= tree[c].mid) getsum(L(c),p,v);
     42     else if(p > tree[c].mid ) getsum (R(c),p,v);
     43     else
     44     {
     45         getsum(L(c),p,tree[c].mid);
     46         getsum(R(c),tree[c].mid+1, v );
     47     }
     48 }
     49 int ok =0 ;
     50 void update(int c, int p)
     51 {   tree[c].num -- ;
     52     if(tree[c].left == tree[c].right)
     53     {
     54         ok = tree[c].left;
     55         return;
     56     }
     57     if(tree[L(c)].num >= p ) update(L(c),p);
     58     else update(R(c),p - tree[L(c)].num);
     59 }
     60 char str[MAXN][13];
     61 int RPrime[]={//反素数
     62     1,2,4,6,12,24,36,48,60,120,180,240,360,720,840,
     63 1260,1680,2520,5040,7560,10080,15120,20160,25200,27720,
     64 45360,50400,55440,83160,110880,166320,221760,277200,
     65 332640,498960,554400,665280
     66 };
     67 
     68 int fact[]={//反素数约数个数
     69     1,2,3,4,6,8,9,10,12,16,18,20,24,30,32,36,40,48,60,64,72,80,84,
     70 90,96,100,108,120,128,144,160,168,180,192,200,216,224
     71 };
     72 
     73 int main()
     74 {
     75 
     76     while(scanf("%d %d",&n,&k) != EOF)
     77     {
     78         int P = 0 ;
     79         for(int i= 0; RPrime[i]<= n;i++)P=i;
     80         for(int i = 1;i <= n;i ++)
     81         {
     82             scanf("%s %d",str[i],&a[i]);
     83         }
     84         build(1,1,n);
     85         update(1,k);
     86         int temp = a[k];
     87         int t = 1 ;
     88         int temps = k ;
     89         if(t < RPrime[P])
     90         while(tree[1].num != 0)
     91         {
     92             t ++ ;
     93             if(temp < 0 )
     94             {
     95                 tsum = 0 ;
     96                 getsum(1,1,temps);
     97                 temp = (-temp)%(tree[1].num);
     98                 if(temp == 0 )
     99                     temp = tree[1].num;
    100                 if(tsum >= temp)
    101                 {
    102                     update(1,tsum-temp + 1);
    103                 }
    104                 else
    105                 {
    106                     update(1,tree[1].num - (temp - tsum) + 1 );
    107                 }
    108             }
    109             else
    110             {
    111                 tsum = 0 ;
    112                 getsum(1,temps,n);
    113                 temp = temp%(tree[1].num);
    114                 if(temp == 0 )
    115                     temp = tree[1].num;
    116                 if(tsum >= temp)
    117                 {
    118                     update(1,tree[1].num - (tsum - temp));
    119                 }
    120                 else
    121                 {
    122                     update(1,temp - tsum);
    123                 }
    124             }
    125             temps = ok;
    126             temp = a[ok];
    127         //    printf("%d
    ",ok);
    128 
    129             if(t >= RPrime[P])
    130                 break;
    131 
    132         }
    133         printf("%s %d
    ",str[ok],fact[P]);
    134     }
    135     return 0 ;
    136 }
    View Code

    ps:poj上排名第一的既然是3xian,应该是用图灵树撸过的,无限orz!

    没有梦想,何谈远方
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  • 原文地址:https://www.cnblogs.com/zyue/p/3228382.html
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