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답안 #301375

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
301375 2020-09-17T21:30:05 Z KWang31 슈퍼트리 잇기 (IOI20_supertrees) Java 11
21 / 100
 473 ms 58316 KB 
import java.io.*; import java.util.*;
public class supertrees {

    static class Pair implements Comparable<Pair>{
        int v; int l0;
        public Pair(int a, int b){
            this.v=a; this.l0=b;
        }
        public int compareTo(Pair other){//Sort by l0 values
            if(this.l0>other.l0)return 1;
            if(this.l0<other.l0)return -1;
            if(this.v<other.v)return -1;
            if(this.v>other.v)return 1;
            return 0;
        }
    }
    /*
    public static void main(String[] args) throws IOException {
        // Tester code
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        int N=Integer.parseInt(br.readLine());
        int[][] p=new int[N][N];
        for (int i = 0; i < N; i++) {
            StringTokenizer st=new StringTokenizer(br.readLine());
            for (int j = 0; j < N; j++) {
                p[i][j]=Integer.parseInt(st.nextToken());
            }
        }
        System.out.println(construct(p));
    }
*/
    public static int construct(int[][] p){
        int N=p.length;
        
        int[][] b=new int[N][N];
        int[] rank1=new int[N];//Consider the graph of 1-edges
        int[] rank0=new int[N];//Graph of 1,2-edges
        int[] siz0=new int[N];//Component size: size of 3 may arouse exceptions
        int[] par1=new int[N];
        int[] par0=new int[N];
        
        for (int i =0; i < N; i++) {
            par1[i]=i; par0[i]=i; siz0[i]=1;
        }
        int ii,jj;
        for (int i = 0; i < N; i++) {
            for (int j = i+1; j < N; j++) {
                if(p[i][j]==1){
                    ii=find(i,par1); jj=find(j,par1);
                    if(ii!=jj){
                        if(rank1[ii]<rank1[jj]){
                            par1[ii]=jj;
                        }else if(rank1[ii]==rank1[jj]){
                            par1[ii]=jj; rank1[jj]++;
                        }else{
                            par1[jj]=ii;
                        }
                    }
                    ii=find(i,par0); jj=find(j,par0);
                    if(ii!=jj){
                        if(rank0[ii]<rank0[jj]){
                            par0[ii]=jj; siz0[jj]+=siz0[ii];
                        }else if(rank0[ii]==rank0[jj]){
                            par0[ii]=jj; rank0[jj]++;siz0[jj]+=siz0[ii];
                        }else{
                            par0[jj]=ii;siz0[ii]+=siz0[jj];
                        }
                    }
                }else if(p[i][j]==2){
                    ii=find(i,par1); jj=find(j,par1);
                    if(ii==jj){//Deals with case i)
                        return 0;
                    }
                    
                    ii=find(i,par0); jj=find(j,par0);
                    if(ii!=jj){
                        if(rank0[ii]<rank0[jj]){
                            par0[ii]=jj;siz0[jj]+=siz0[ii];
                        }else if(rank0[ii]==rank0[jj]){
                            par0[ii]=jj; rank0[jj]++;siz0[jj]+=siz0[ii];
                        }else{
                            par0[jj]=ii;siz0[ii]+=siz0[jj];
                        }
                    }
                }else if(p[i][j]==3){
                    return 0;
                }else{
                    ii=find(i,par0); jj=find(j,par0);
                    if(ii==jj)return 0;
                }
            }
        }
        
        //Go over all components of size 3 again
        int[][] comp=new int[N][2];
        for (int i = 0; i < N; i++) {
            comp[i][0]=-1; comp[i][1]=-1;
        }
        for (int i = 0; i < N; i++) {
            ii=find(i,par0);
            if(siz0[ii]==3){
                if(i!=ii){
                    if(comp[ii][0]==-1){
                        comp[ii][0]=i;
                    }else{
                        comp[ii][1]=i;
                    }
                }
            }
        }
        
        for (int i = 0; i < N; i++) {
            if(comp[i][0]!=-1){
                int a=p[i][comp[i][0]];
                int x=p[i][comp[i][1]];
                int c=p[comp[i][0]][comp[i][1]];
                if(a!=x || x!=c || c!=a){
                    return 0;
                }
            }
        }
        TreeSet<Pair> leads=new TreeSet<>();//Include leaders of all 1-components
        
        for (int i = 0; i < N; i++) {//1-graphs
            
            ii=find(i,par1);
            if(ii!=i){
                b[i][ii]=1; b[ii][i]=1;
                
                //Same component guys don't matter
            }
            if(find(ii,par0)!=ii){
                leads.add(new Pair(ii,find(ii,par0)));
            }
            
        }
        
        int prevl=-1;int prevv=0; 
        int prevo=0;//Completes the cycle
        int save=0;
        for (Pair q: leads) {
            
            if(prevl!=q.l0){
                if(prevl!=-1){
                    b[prevv][prevo]=1;b[prevo][prevv]=1;
                } 
                b[q.v][q.l0]=1; b[q.l0][q.v]=1;
                prevl=q.l0; prevo=q.v; 
                
            }else{
                b[q.v][prevv]=1; b[prevv][q.v]=1;
                
            }
            prevv=q.v; save=q.l0;
        }
        if(prevv!=save){b[prevv][save]=1; b[save][prevv]=1;}
        //Last fill
        //The leaders of every component forms a cycle as long as they're connected in the >=1 graph
        grader.build(b);
        /*
        for (int i = 0; i < N; i++) {
            System.out.println(Arrays.toString(b[i]));
        }
*/
        return 1;
    }
    
    public static int find(int x, int[] par){
        if(par[x]==x)return x;
        int ans=find(par[x],par);
        par[x]=ans; return ans;
    }
}

Subtask #1
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 78 ms 10356 KB Output is correct
2 Correct 79 ms 10472 KB Output is correct
3 Correct 78 ms 10352 KB Output is correct
4 Correct 77 ms 10344 KB Output is correct
5 Correct 80 ms 10468 KB Output is correct
6 Correct 143 ms 15096 KB Output is correct
7 Correct 447 ms 56412 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 78 ms 10356 KB Output is correct
2 Correct 79 ms 10472 KB Output is correct
3 Correct 78 ms 10352 KB Output is correct
4 Correct 77 ms 10344 KB Output is correct
5 Correct 80 ms 10468 KB Output is correct
6 Correct 143 ms 15096 KB Output is correct
7 Correct 447 ms 56412 KB Output is correct
8 Correct 79 ms 10680 KB Output is correct
9 Correct 79 ms 10492 KB Output is correct
10 Correct 78 ms 10176 KB Output is correct
11 Correct 78 ms 10356 KB Output is correct
12 Correct 171 ms 15332 KB Output is correct
13 Correct 471 ms 57672 KB Output is correct
14 Correct 80 ms 10216 KB Output is correct
15 Correct 77 ms 10084 KB Output is correct
16 Correct 99 ms 11136 KB Output is correct
17 Correct 139 ms 19308 KB Output is correct
18 Correct 80 ms 10232 KB Output is correct
19 Correct 77 ms 10232 KB Output is correct
20 Correct 332 ms 24736 KB Output is correct
21 Correct 446 ms 56356 KB Output is correct
22 Correct 436 ms 56880 KB Output is correct
23 Correct 454 ms 56616 KB Output is correct
24 Correct 418 ms 57552 KB Output is correct
25 Correct 170 ms 20172 KB Output is correct
26 Correct 157 ms 19960 KB Output is correct
27 Correct 428 ms 56568 KB Output is correct
28 Correct 442 ms 57444 KB Output is correct

Subtask #3
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 80 ms 10488 KB Output is correct
2 Correct 77 ms 10232 KB Output is correct
3 Correct 77 ms 10360 KB Output is correct
4 Incorrect 77 ms 10344 KB Answer gives possible 1 while actual possible 0
5 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 80 ms 10356 KB Output is correct
2 Correct 83 ms 10212 KB Output is correct
3 Correct 78 ms 10236 KB Output is correct
4 Correct 309 ms 28100 KB Output is correct
5 Correct 473 ms 57728 KB Output is correct
6 Correct 434 ms 58316 KB Output is correct
7 Correct 440 ms 56560 KB Output is correct
8 Correct 86 ms 10484 KB Output is correct
9 Incorrect 328 ms 28140 KB Too few ways to get from 0 to 5, should be 2 found 1
10 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 78 ms 10356 KB Output is correct
2 Correct 79 ms 10472 KB Output is correct
3 Correct 78 ms 10352 KB Output is correct
4 Correct 77 ms 10344 KB Output is correct
5 Correct 80 ms 10468 KB Output is correct
6 Correct 143 ms 15096 KB Output is correct
7 Correct 447 ms 56412 KB Output is correct
8 Correct 79 ms 10680 KB Output is correct
9 Correct 79 ms 10492 KB Output is correct
10 Correct 78 ms 10176 KB Output is correct
11 Correct 78 ms 10356 KB Output is correct
12 Correct 171 ms 15332 KB Output is correct
13 Correct 471 ms 57672 KB Output is correct
14 Correct 80 ms 10216 KB Output is correct
15 Correct 77 ms 10084 KB Output is correct
16 Correct 99 ms 11136 KB Output is correct
17 Correct 139 ms 19308 KB Output is correct
18 Correct 80 ms 10232 KB Output is correct
19 Correct 77 ms 10232 KB Output is correct
20 Correct 332 ms 24736 KB Output is correct
21 Correct 446 ms 56356 KB Output is correct
22 Correct 436 ms 56880 KB Output is correct
23 Correct 454 ms 56616 KB Output is correct
24 Correct 418 ms 57552 KB Output is correct
25 Correct 170 ms 20172 KB Output is correct
26 Correct 157 ms 19960 KB Output is correct
27 Correct 428 ms 56568 KB Output is correct
28 Correct 442 ms 57444 KB Output is correct
29 Correct 80 ms 10488 KB Output is correct
30 Correct 77 ms 10232 KB Output is correct
31 Correct 77 ms 10360 KB Output is correct
32 Incorrect 77 ms 10344 KB Answer gives possible 1 while actual possible 0
33 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 78 ms 10356 KB Output is correct
2 Correct 79 ms 10472 KB Output is correct
3 Correct 78 ms 10352 KB Output is correct
4 Correct 77 ms 10344 KB Output is correct
5 Correct 80 ms 10468 KB Output is correct
6 Correct 143 ms 15096 KB Output is correct
7 Correct 447 ms 56412 KB Output is correct
8 Correct 79 ms 10680 KB Output is correct
9 Correct 79 ms 10492 KB Output is correct
10 Correct 78 ms 10176 KB Output is correct
11 Correct 78 ms 10356 KB Output is correct
12 Correct 171 ms 15332 KB Output is correct
13 Correct 471 ms 57672 KB Output is correct
14 Correct 80 ms 10216 KB Output is correct
15 Correct 77 ms 10084 KB Output is correct
16 Correct 99 ms 11136 KB Output is correct
17 Correct 139 ms 19308 KB Output is correct
18 Correct 80 ms 10232 KB Output is correct
19 Correct 77 ms 10232 KB Output is correct
20 Correct 332 ms 24736 KB Output is correct
21 Correct 446 ms 56356 KB Output is correct
22 Correct 436 ms 56880 KB Output is correct
23 Correct 454 ms 56616 KB Output is correct
24 Correct 418 ms 57552 KB Output is correct
25 Correct 170 ms 20172 KB Output is correct
26 Correct 157 ms 19960 KB Output is correct
27 Correct 428 ms 56568 KB Output is correct
28 Correct 442 ms 57444 KB Output is correct
29 Correct 80 ms 10488 KB Output is correct
30 Correct 77 ms 10232 KB Output is correct
31 Correct 77 ms 10360 KB Output is correct
32 Incorrect 77 ms 10344 KB Answer gives possible 1 while actual possible 0
33 Halted 0 ms 0 KB -