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Submission #301331

# Submission time Handle Problem Language Result Execution time Memory
301331 2020-09-17T20:57:08 Z Gilgamesh Connecting Supertrees (IOI20_supertrees) C++17
21 / 100
 273 ms 22136 KB 
#include "supertrees.h"
#include <vector>

const int mxN = 1000;

int parent[mxN];
int rnk[mxN];

int find(int x) 
{ 
    if(parent[x] == -1)
        parent[x] = x;
    if (parent[x] != x) { 
        parent[x] = find(parent[x]); 
    }
    return parent[x]; 
}
bool merge(int x, int y) 
{ 
    int xRoot = find(x), yRoot = find(y); 
    if (xRoot == yRoot) 
        return false; 
    if (rnk[xRoot] < rnk[yRoot]) 
        parent[xRoot] = yRoot; 
    else if (rnk[yRoot] < rnk[xRoot]) 
        parent[yRoot] = xRoot; 
    else 
    { 
        parent[yRoot] = xRoot; 
        rnk[xRoot] = rnk[xRoot] + 1; 
    } 
    return true;
} 

int construct(std::vector<std::vector<int>> p) {
    int n = p.size();
    std::vector<std::vector<int>> answer;
    for (int i = 0; i < n; i++) {
        std::vector<int> row;
        row.resize(n);
        answer.push_back(row);
    }
    bool zero = false, one = false, two = false, three = false;
    for(int i = 0; i < n; ++i){
        for(int j = 0; j < n; ++j){
            if(p[i][j] == 0) zero = true;
            else if(p[i][j] == 1) one = true;
            else if(p[i][j] == 2) two = true;
            else three = true;
        }
    }
    for(int i = 0; i < n; ++i){
        parent[i] = i;
    }
    if(!one && !three){
        for(int i = 0; i < n; ++i){
            for(int j = i + 1; j < n; ++j){
                if(!p[i][j] && find(i) == find(j)){
                    return 0;
                }
                if(p[i][j]) merge(i, j);
            }
        }
        for(int i = 0; i < n; ++i){
            for(int j = i + 1; j < n; ++j){
                if(!p[i][j] && find(i) == find(j)) return 0;
            }
        }
        std::vector<int> sets[n];
        for(int i = 0; i < n; ++i){
            int rep = find(i);
            sets[rep].emplace_back(i);
        }
        for(int i = 0; i < n; ++i){
            int sz = sets[i].size();
            if(sz == 2) return 0;
            for(int j = 0; j < sz - 1; ++j){
                answer[sets[i][j]][sets[i][j + 1]] = 1;
                answer[sets[i][j + 1]][sets[i][j]] = 1;
            }
            if(sz > 1){
                answer[sets[i][0]][sets[i][sz-1]] = 1;
                answer[sets[i][sz-1]][sets[i][0]] = 1;
            }
        }
    }
    else {
        for(int i = 0; i < n; ++i){
            for(int j = i + 1; j < n; ++j){
                if(!p[i][j] && find(i) == find(j)){
                    return 0;
                }
                if(p[i][j]) merge(i, j);
            }
        }
        for(int i = 0; i < n; ++i){
            for(int j = i + 1; j < n; ++j){
                if(!p[i][j] && find(i) == find(j)) return 0;
            }
        }
        for(int i = 0; i < n; ++i){
            int rep = find(i);
            if(rep == i) continue;
            answer[rep][i] = 1;
            answer[i][rep] = 1;
        }
    }
    build(answer);
    return 1;
}

Compilation message

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:43:10: warning: variable 'zero' set but not used [-Wunused-but-set-variable]
   43 |     bool zero = false, one = false, two = false, three = false;
      |          ^~~~
supertrees.cpp:43:37: warning: variable 'two' set but not used [-Wunused-but-set-variable]
   43 |     bool zero = false, one = false, two = false, three = false;
      |                                     ^~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 0 ms 256 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 11 ms 1164 KB Output is correct
7 Correct 273 ms 22060 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 0 ms 256 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 11 ms 1164 KB Output is correct
7 Correct 273 ms 22060 KB Output is correct
8 Correct 0 ms 256 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Correct 1 ms 256 KB Output is correct
12 Correct 11 ms 1152 KB Output is correct
13 Correct 249 ms 22116 KB Output is correct
14 Correct 0 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 5 ms 768 KB Output is correct
17 Correct 131 ms 12108 KB Output is correct
18 Correct 0 ms 256 KB Output is correct
19 Correct 0 ms 256 KB Output is correct
20 Correct 74 ms 5828 KB Output is correct
21 Correct 268 ms 22136 KB Output is correct
22 Correct 269 ms 22100 KB Output is correct
23 Correct 270 ms 22092 KB Output is correct
24 Correct 260 ms 22096 KB Output is correct
25 Correct 127 ms 12116 KB Output is correct
26 Correct 122 ms 12112 KB Output is correct
27 Correct 270 ms 22136 KB Output is correct
28 Correct 268 ms 22096 KB Output is correct

Subtask #3
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 0 ms 256 KB Output is correct
4 Incorrect 0 ms 256 KB Answer gives possible 1 while actual possible 0
5 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Incorrect 0 ms 256 KB Too few ways to get from 0 to 1, should be 2 found 1
3 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 0 ms 256 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 11 ms 1164 KB Output is correct
7 Correct 273 ms 22060 KB Output is correct
8 Correct 0 ms 256 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Correct 1 ms 256 KB Output is correct
12 Correct 11 ms 1152 KB Output is correct
13 Correct 249 ms 22116 KB Output is correct
14 Correct 0 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 5 ms 768 KB Output is correct
17 Correct 131 ms 12108 KB Output is correct
18 Correct 0 ms 256 KB Output is correct
19 Correct 0 ms 256 KB Output is correct
20 Correct 74 ms 5828 KB Output is correct
21 Correct 268 ms 22136 KB Output is correct
22 Correct 269 ms 22100 KB Output is correct
23 Correct 270 ms 22092 KB Output is correct
24 Correct 260 ms 22096 KB Output is correct
25 Correct 127 ms 12116 KB Output is correct
26 Correct 122 ms 12112 KB Output is correct
27 Correct 270 ms 22136 KB Output is correct
28 Correct 268 ms 22096 KB Output is correct
29 Correct 0 ms 256 KB Output is correct
30 Correct 0 ms 256 KB Output is correct
31 Correct 0 ms 256 KB Output is correct
32 Incorrect 0 ms 256 KB Answer gives possible 1 while actual possible 0
33 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 0 ms 256 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 11 ms 1164 KB Output is correct
7 Correct 273 ms 22060 KB Output is correct
8 Correct 0 ms 256 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Correct 1 ms 256 KB Output is correct
12 Correct 11 ms 1152 KB Output is correct
13 Correct 249 ms 22116 KB Output is correct
14 Correct 0 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 5 ms 768 KB Output is correct
17 Correct 131 ms 12108 KB Output is correct
18 Correct 0 ms 256 KB Output is correct
19 Correct 0 ms 256 KB Output is correct
20 Correct 74 ms 5828 KB Output is correct
21 Correct 268 ms 22136 KB Output is correct
22 Correct 269 ms 22100 KB Output is correct
23 Correct 270 ms 22092 KB Output is correct
24 Correct 260 ms 22096 KB Output is correct
25 Correct 127 ms 12116 KB Output is correct
26 Correct 122 ms 12112 KB Output is correct
27 Correct 270 ms 22136 KB Output is correct
28 Correct 268 ms 22096 KB Output is correct
29 Correct 0 ms 256 KB Output is correct
30 Correct 0 ms 256 KB Output is correct
31 Correct 0 ms 256 KB Output is correct
32 Incorrect 0 ms 256 KB Answer gives possible 1 while actual possible 0
33 Halted 0 ms 0 KB -