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HDU 6040 Hints of sd0061 nth_element函数

2024-11-17 22:12:39   202人阅读

Hints of sd0061

 

Problem Description
sd0061, the legend of Beihang University ACM-ICPC Team, retired last year leaving a group of noobs. Noobs have no idea how to deal with m coming contests. sd0061 has left a set of hints for them.

There are n noobs in the team, the i-th of which has a rating ai. sd0061 prepares one hint for each contest. The hint for the j-th contest is a number bj, which means that the noob with the (bj+1)-th lowest rating is ordained by sd0061 for the j-th contest.

The coach asks constroy to make a list of contestants. constroy looks into these hints and finds out: bi+bj≤bk is satisfied if bi≠bj, bi<bk and bj<bk.

Now, you are in charge of making the list for constroy.
 
Input
There are multiple test cases (about 10).

For each test case:

The first line contains five integers n,m,A,B,C. (1≤n≤107,1≤m≤100)

The second line contains m integers, the i-th of which is the number bi of the i-th hint. (0≤bi<n)

The n noobs‘ ratings are obtained by calling following function n times, the i-th result of which is ai.

unsigned x = A, y = B, z = C;
unsigned rng61() {
  unsigned t;
  x ^= x << 16;
  x ^= x >> 5;
  x ^= x << 1;
  t = x;
  x = y;
  y = z;
  z = t ^ x ^ y;
  return z;
}

 

Output
For each test case, output "Case #x: y1 y2 ? ym" in one line (without quotes), where x indicates the case number starting from 1 and yi (1≤i≤m) denotes the rating of noob for the i-th contest of corresponding case.
 
Sample Input
3 3 1 1 10 1 22 2 2 2 21 1
 
Sample Output
Case #1: 1 1 202755 Case #2: 405510 405510

 

 

题意：

　　给你一个长度n的排列，给你生成排列的函数

　　求m次第k小

题解：

　　nth_element

　　表示在数组A的[0,n-1]中找到第k小的并放在第k个位置，并且前k-1个位置均为小于A[k]的数

#include<bits/stdc++.h>using namespace std;#pragma comment(linker, "/STACK:102400000,102400000")#define ls i<<1#define rs ls | 1#define mid ((ll+rr)>>1)#define pii pair<int,int>#define MP make_pairtypedef long long LL;const long long INF = 1e18+1LL;const double pi = acos(-1.0);const int N = 1e7+10, M = 1e3+20,inf = 2e9;unsigned x,y,z;unsigned rng61() {  unsigned t;  x ^= x << 16;  x ^= x >> 5;  x ^= x << 1;  t = x;  x = y;  y = z;  z = t ^ x ^ y;  return z;}struct ss{    int id,x;    bool operator<(const ss& r) const{        return x < r.x;    }}b[N];int n,m;unsigned ans[N],a[N];int main() {    int cas = 1;    while(scanf("%d%d%u%u%u",&n,&m,&x,&y,&z)!=EOF) {        for(int i = 1; i <= m; ++i)            scanf("%d",&b[i].x),b[i].id = i;        for(int i = 0; i < n; ++i) a[i] = rng61();        sort(b+1,b+m+1);        b[m+1].x = n;        for(int i = m; i >= 1; --i) {            nth_element(a,a+b[i].x,a+b[i+1].x);            ans[b[i].id] = a[b[i].x];        }        printf("Case #%d: ",cas++);        for(int i = 1; i < m; ++i) printf("%u ",ans[i]);        printf("%u\n",ans[m]);    }}

 

HDU 6040 Hints of sd0061 nth_element函数


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