제출 #344415

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
344415		KWang31	Gift (IZhO18_nicegift)	Java	0 / 100	272 ms	54044 KiB

nicegift

import java.io.*; import java.util.*;
public class nicegift{
  static class FastReader 
    { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new
                     InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        
    } 
    public static class Pair implements Comparable<Pair>{
        int ind; long val;
        public Pair(int a, long b){
            this.ind=a; this.val=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;
        }
    }
    static int MOD=998244353;
    static int[] rk, p,siz;
    public static void main(String[] args){
        FastReader br=new FastReader();
        int N=br.nextInt(); int K=br.nextInt();
        Pair[] a=new Pair[N];
        long sum=0; long max=0;
        for (int i = 0; i < N; i++) {
            a[i]=new Pair(1+i,br.nextInt()); sum+=a[i].val; max=Math.max(max,a[i].val);
        }
        if(sum%K>0 || sum/K < max){
            System.out.println("-1");return;
        }
        //A number is bottle neck if a[i]
        Arrays.sort(a);
        long cur=sum/K;
 
        //Tracks K+1 elements
        long d;StringBuilder ans=new StringBuilder();
        int op=0; int lp=0; int rp=N-1; long v;
        for (int j = 0; j < N; j++) {
        	
        	while(lp<N && a[lp].val==0) {
        		lp++;
        	}
        	while(rp>=0 && a[rp].val==cur) {
            	rp--;
            }
        	if(rp<lp+K)break;
        	//System.out.println(j+" "+lp+" "+rp);
            d=Math.min(a[lp].val, cur-a[rp].val);
            if(d==0)continue;
            op++;
            //System.out.println(j+" "+cur+" "+d);
            ans.append(d+" ");
            //System.out.println(lp+K-(N-rp-1));
            for(int k=lp; k<lp+K-(N-rp-1); k++) {//There are at least K elements
            	v=a[k].val-d; a[k]=new Pair(a[k].ind,v); ans.append(a[k].ind+" ");
            	
            }
            for(int k=rp+1; k<N; k++) {
            	v=a[k].val-d; a[k]=new Pair(a[k].ind,v); ans.append(a[k].ind+" ");
            }
            cur-=d;
            ans.append("\n");
        }
        //Now K of them are "bottlenecks"
        
        boolean val=false;
        for (int i = 0; i < N; i++) {
            if(a[i].val>0){
            	
                if(!val){
                    val=true;
                    op++;
                    ans.append(a[i].val+" ");
                }
                ans.append(a[i].ind+" ");
            }
        }
        System.out.println(op);
        System.out.println(ans.toString());
    }
    
    
}
//Debugging:
//Are you sure your algorithm is correct?
//Bounds: long
//Special cases: n=0,1?
//Make sure you remove your debugging code before you submit!

• Subtask 1: 0 / 7
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• Subtask 3: 0 / 12
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