oj.uz

Submission #808108

# Submission time Handle Problem Language Result Execution time Memory
808108 2023-08-05T04:37:19 Z The_Samurai Connecting Supertrees (IOI20_supertrees) C++17
19 / 100
 226 ms 24040 KB 
#include "bits/stdc++.h"
#ifdef sunnatov
#include "grader.cpp"
#else
#include "supertrees.h"
#endif

using namespace std;

struct dsu {
    vector<int> p, size;

    void init(int n) {
        p.assign(n, 0);
        size.assign(n, 1);
        for (int i = 0; i < n; i++) p[i] = i;
    }

    int get(int a) {
        return p[a] == a ? a : p[a] = get(p[a]);
    }

    void add(int a, int b) {
        a = get(a);
        b = get(b);
        if (a == b) return;
        if (size[a] > size[b]) swap(a, b);
        size[b] += size[a];
        p[a] = b;
    }
};


int construct(std::vector<std::vector<int>> p) {
	int n = p.size();

    vector<vector<int>> g(n, vector<int>(n));
    dsu ds;
    ds.init(n);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (p[i][j] == 2) {
                ds.add(i, j);
            }
        }
    }
    vector<bool> vis(n);
    for (int _ = 0; _ < n; _++) {
        int s = -1;
        vector<int> v;
        for (int i = 0; i < n; i++) {
            if (vis[i]) continue;
            if (s == -1) s = ds.get(i);
            if (ds.get(i) != s) continue;
            v.emplace_back(i);
        }
        if (v.empty()) break;
        for (int i = 0; i < v.size(); i++) {
            for (int j = i + 1; j < v.size(); j++) {
                if (!p[v[i]][v[j]]) return 0;
            }
        }
        for (int i = 1; i < v.size(); i++) g[v[i - 1]][v[i]] = g[v[i]][v[i - 1]] = 1;
        if (v.size() == 2) return 0;
        if (v.size() > 1) g[v[0]][v.back()] = g[v.back()][v[0]] = 1;
        for (int x: v) vis[x] = true;
    }
    build(g);

	return 1;
}

Compilation message

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:58:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |         for (int i = 0; i < v.size(); i++) {
      |                         ~~^~~~~~~~~~
supertrees.cpp:59:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |             for (int j = i + 1; j < v.size(); j++) {
      |                                 ~~^~~~~~~~~~
supertrees.cpp:63:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         for (int i = 1; i < v.size(); i++) g[v[i - 1]][v[i]] = g[v[i]][v[i - 1]] = 1;
      |                         ~~^~~~~~~~~~

Subtask #1
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 0 ms 212 KB Too few ways to get from 0 to 1, should be 1 found 0
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 0 ms 212 KB Too few ways to get from 0 to 1, should be 1 found 0
3 Halted 0 ms 0 KB -

Subtask #3
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 300 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 8 ms 1240 KB Output is correct
9 Correct 160 ms 24008 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 296 KB Output is correct
12 Correct 7 ms 1236 KB Output is correct
13 Correct 148 ms 23908 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 300 KB Output is correct
16 Correct 4 ms 852 KB Output is correct
17 Correct 69 ms 14064 KB Output is correct
18 Correct 1 ms 304 KB Output is correct
19 Correct 1 ms 300 KB Output is correct
20 Correct 1 ms 300 KB Output is correct
21 Correct 36 ms 6228 KB Output is correct
22 Correct 145 ms 23940 KB Output is correct
23 Correct 213 ms 23920 KB Output is correct
24 Correct 151 ms 23920 KB Output is correct
25 Correct 61 ms 14068 KB Output is correct
26 Correct 63 ms 14072 KB Output is correct
27 Correct 151 ms 24012 KB Output is correct
28 Correct 226 ms 24040 KB Output is correct
29 Correct 59 ms 14068 KB Output is correct

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 232 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Incorrect 1 ms 212 KB Too few ways to get from 1 to 2, should be 1 found 0
4 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 0 ms 212 KB Too few ways to get from 0 to 1, should be 1 found 0
3 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 0 ms 212 KB Too few ways to get from 0 to 1, should be 1 found 0
3 Halted 0 ms 0 KB -