제출 #318732

#제출 시각아이디문제언어결과실행 시간메모리
318732KWang31카니발 티켓 (IOI20_tickets)Java
27 / 100
698 ms84040 KiB
import java.io.*; import java.util.*; public class tickets { static class Pair implements Comparable<Pair>{ int val; int ind; public Pair(int a, int b){ this.val=a; this.ind=b; } public int compareTo(Pair other){ if(this.val<other.val)return -1; if(this.val>other.val)return 1; if(this.ind>other.ind)return -1; return 1; } } public static long find_maximum(int k, int[][] x){ long ans=0; PriorityQueue<Pair> pq=new PriorityQueue<>(); int n=x.length; int m=x[0].length; int[] lp=new int[n]; // rp = (N-1) - i + lp int[][] s=new int[n][m]; for (int i = 0; i < n; i++) { Arrays.fill(s[i],-1); } boolean[] b=new boolean[n]; for(int i=0;i<k;i++) { for (int j = 0; j < n; j++) { ans+=x[j][m-1-i+lp[j]]; pq.add(new Pair(x[j][lp[j]]+x[j][m-1-i+lp[j]],j)); } b=new boolean[n]; for (int j = 0; j < n/2; j++) { Pair p=pq.poll(); ans-=p.val; s[p.ind][lp[p.ind]]=i; lp[p.ind]++; b[p.ind]=true; } for (int j = 0; j < n; j++) { if(!b[j]){ s[j][m-1-i+lp[j]]=i; } } } grader.allocate_tickets(s); return ans; } }
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