oj.uz

Submission #301441

# Submission time Handle Problem Language Result Execution time Memory
301441 2020-09-18T00:32:10 Z qpwoeirut Connecting Supertrees (IOI20_supertrees) C++17
11 / 100
 274 ms 22268 KB 
#include "supertrees.h"
#include <bits/stdc++.h>

using namespace std;

typedef vector<vector<int>> vvi;

int N;

int sub1(const vvi& p) {
    vvi ans(N, vector<int>(N));
    for (int i=1; i<N; ++i) {
        ans[0][i] = 1;
    }
    build(ans);
    return 1;
}

const int MN = 1001;
int root[MN];
int par(int u) {
    if (u == root[u]) return u;
    root[u] = par(root[u]);
    return root[u];
}
void join(int u, int v) {
    if (par(u) == par(v)) return;
    root[u] = v;
}
bool dsu(const vvi& p) {
    for (int i=0; i<N; ++i) {
        root[i] = i;
    }
    for (int i=0; i<N; ++i) {
        for (int j=0; j<N; ++j) {
            if (p[i][j]) join(i, j);
        }
    }
    
    for (int i=0; i<N; ++i) {
        for (int j=0; j<N; ++j) {
            if (par(i) == par(j) && p[i][j] == 0) {
                return 0;
            }
        }
    }
    return 1;
}
int sub2(const vvi& p) {
    if (!dsu(p)) return 0;
    vvi ans(N, vector<int>(N));
    for (int i=0; i<N; ++i) {
        if (i != par(i)) {
            ans[i][par(i)] = true;
            ans[par(i)][i] = true;
        }
    }
    build(ans);
    return 1;
}
int sub3(const vvi& p) {
    if (!dsu(p)) return 0;
    vvi ans(N, vector<int>(N));
    vvi groups;
    for (int i=0; i<N; ++i) {
        if (i == par(i)) {
            vector<int> cur;
            for (int j=0; j<N; ++j) {
                if (i == par(j)) {
                    cur.push_back(j);
                }
            }
            groups.push_back(cur);
        }
    }
    for (int i=0; i<groups.size(); ++i) {
        int gsz = groups[i].size();
        for (int j=0; j<gsz; ++j) {
            ans[groups[i][(j+1) % gsz]][groups[i][j]] = ans[groups[i][j]][groups[i][(j+1) % gsz]] = 1;
        }
    }

    build(ans);
    return 1;
}

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

    set<int> vals;
    for (int i=0; i<N; ++i) {
        for (int j=0; j<N; ++j) {
            vals.insert(p[i][j]);
        }
    }

    //if (vals.size() == 1) {
    //    if (vals.count(0)) {
    //        vvi ans(N, vector<int>(N));
    //        build(ans);
    //        return 1;
    //    }
    //    if (vals.count(1)) {
    //        return sub1(p);
    //    }
    //}
    if (vals.size() <= 2) {
        if (vals.count(1)) {
            return sub2(p);
        }
        if (vals.count(2)) {
            return sub3(p);
        }
    }
    return 0;
}

Compilation message

supertrees.cpp: In function 'int sub3(const vvi&)':
supertrees.cpp:76:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |     for (int i=0; i<groups.size(); ++i) {
      |                   ~^~~~~~~~~~~~~~

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 0 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 11 ms 1152 KB Output is correct
7 Correct 256 ms 22136 KB Output is correct

Subtask #2
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 0 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 11 ms 1152 KB Output is correct
7 Correct 256 ms 22136 KB Output is correct
8 Correct 0 ms 256 KB Output is correct
9 Correct 0 ms 256 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Correct 0 ms 256 KB Output is correct
12 Correct 13 ms 1152 KB Output is correct
13 Correct 251 ms 22136 KB Output is correct
14 Correct 0 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 6 ms 640 KB Output is correct
17 Correct 130 ms 8268 KB Output is correct
18 Correct 1 ms 256 KB Output is correct
19 Correct 0 ms 256 KB Output is correct
20 Correct 64 ms 5752 KB Output is correct
21 Correct 257 ms 22116 KB Output is correct
22 Correct 253 ms 22108 KB Output is correct
23 Correct 274 ms 22268 KB Output is correct
24 Correct 249 ms 22136 KB Output is correct
25 Incorrect 255 ms 22264 KB Answer gives possible 1 while actual possible 0
26 Halted 0 ms 0 KB -

Subtask #3
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 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 1 ms 256 KB Output is correct
2 Incorrect 1 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 0 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 11 ms 1152 KB Output is correct
7 Correct 256 ms 22136 KB Output is correct
8 Correct 0 ms 256 KB Output is correct
9 Correct 0 ms 256 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Correct 0 ms 256 KB Output is correct
12 Correct 13 ms 1152 KB Output is correct
13 Correct 251 ms 22136 KB Output is correct
14 Correct 0 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 6 ms 640 KB Output is correct
17 Correct 130 ms 8268 KB Output is correct
18 Correct 1 ms 256 KB Output is correct
19 Correct 0 ms 256 KB Output is correct
20 Correct 64 ms 5752 KB Output is correct
21 Correct 257 ms 22116 KB Output is correct
22 Correct 253 ms 22108 KB Output is correct
23 Correct 274 ms 22268 KB Output is correct
24 Correct 249 ms 22136 KB Output is correct
25 Incorrect 255 ms 22264 KB Answer gives possible 1 while actual possible 0
26 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 0 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 11 ms 1152 KB Output is correct
7 Correct 256 ms 22136 KB Output is correct
8 Correct 0 ms 256 KB Output is correct
9 Correct 0 ms 256 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Correct 0 ms 256 KB Output is correct
12 Correct 13 ms 1152 KB Output is correct
13 Correct 251 ms 22136 KB Output is correct
14 Correct 0 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 6 ms 640 KB Output is correct
17 Correct 130 ms 8268 KB Output is correct
18 Correct 1 ms 256 KB Output is correct
19 Correct 0 ms 256 KB Output is correct
20 Correct 64 ms 5752 KB Output is correct
21 Correct 257 ms 22116 KB Output is correct
22 Correct 253 ms 22108 KB Output is correct
23 Correct 274 ms 22268 KB Output is correct
24 Correct 249 ms 22136 KB Output is correct
25 Incorrect 255 ms 22264 KB Answer gives possible 1 while actual possible 0
26 Halted 0 ms 0 KB -