oj.uz

Submission #321118

# Submission time Handle Problem Language Result Execution time Memory
321118 2020-11-11T03:37:23 Z 12tqian Swapping Cities (APIO20_swap) C++14
6 / 100
 156 ms 20144 KB 
#include "swap.h"
#include<bits/stdc++.h>
using namespace std;

const int INF = 1e9;
struct DSU {
    vector<int> e;
    vector<vector<int>> done;
    vector<int> cycle;
    vector<bool> ok;
    void init(int n) {
        e = vector<int>(n, -1);
        done.resize(n);
        cycle = vector<int>(n, INF);
        ok = vector<bool>(n, false);
        for (int i = 0; i < n; i++) {
            done[i].push_back(i);
        }
    }
    int get(int x) {
        return e[x] < 0 ? x : e[x] = get(e[x]);
    }
    bool same_set(int a, int b) {
        return get(a) == get(b);
    }
    int size(int x) {
        return -e[get(x)];
    }
    bool unite(int x, int y, int w) {
        cycle[x] = min(cycle[x], w);
        cycle[y] = min(cycle[y], w);
        x = get(x), y = get(y);
        if (x == y) return false;
        if (e[x] > e[y]) swap(x, y);
        for (int v : done[y]) {
            done[x].push_back(v);
        }
        e[x] += e[y]; e[y] = x;
        return true;
    }
    void purge(int x, int w) {
        x = get(x);
        for (int v : done[x]) {
            cycle[v] = w;
            ok[v] = true;
        }
        done[x].clear();
    }
};
DSU D;
void init(int N, int M,
    std::vector<int> U, std::vector<int> V, std::vector<int> W) {
    vector<array<int, 3>> edges(M);
    for (int i = 0; i < M; i++) {
        edges[i][0] = W[i];
        edges[i][1] = U[i];
        edges[i][2] = V[i];
    }
    sort(edges.begin(), edges.end());
    D.init(N);
    for (auto e : edges) {
        int u = e[1];
        int v = e[2];
        int w = e[0];
        if (D.same_set(u, v)) {
            D.purge(u, w);
        } else {
            D.unite(u, v, w);
        }
    }
}

int getMinimumFuelCapacity(int X, int Y) {
    int ans = max(D.cycle[X], D.cycle[Y]);
    if (ans >= INF || D.ok[X] == false && D.ok[Y] == false) {
        return -1;
    } else {
        return ans;
    }
    return 0;
}

Compilation message

swap.cpp: In function 'int getMinimumFuelCapacity(int, int)':
swap.cpp:75:40: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   75 |     if (ans >= INF || D.ok[X] == false && D.ok[Y] == false) {
      |                       ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 2 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 512 KB Output is correct
8 Correct 1 ms 504 KB Output is correct
9 Correct 70 ms 12768 KB Output is correct
10 Correct 86 ms 15200 KB Output is correct
11 Correct 84 ms 14940 KB Output is correct
12 Correct 88 ms 15844 KB Output is correct
13 Correct 67 ms 13092 KB Output is correct
14 Correct 74 ms 13280 KB Output is correct
15 Correct 154 ms 19552 KB Output is correct
16 Correct 146 ms 19044 KB Output is correct
17 Correct 155 ms 19940 KB Output is correct
18 Correct 138 ms 16992 KB Output is correct
19 Correct 67 ms 7592 KB Output is correct
20 Correct 152 ms 19168 KB Output is correct
21 Correct 151 ms 19156 KB Output is correct
22 Correct 156 ms 20144 KB Output is correct
23 Correct 140 ms 17328 KB Output is correct

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Incorrect 146 ms 15720 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 2 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 512 KB Output is correct
9 Correct 1 ms 504 KB Output is correct
10 Incorrect 1 ms 492 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 2 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 512 KB Output is correct
9 Correct 1 ms 504 KB Output is correct
10 Correct 70 ms 12768 KB Output is correct
11 Correct 86 ms 15200 KB Output is correct
12 Correct 84 ms 14940 KB Output is correct
13 Correct 88 ms 15844 KB Output is correct
14 Correct 67 ms 13092 KB Output is correct
15 Incorrect 1 ms 492 KB Output isn't correct
16 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 2 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 512 KB Output is correct
8 Correct 1 ms 504 KB Output is correct
9 Correct 70 ms 12768 KB Output is correct
10 Correct 86 ms 15200 KB Output is correct
11 Correct 84 ms 14940 KB Output is correct
12 Correct 88 ms 15844 KB Output is correct
13 Correct 67 ms 13092 KB Output is correct
14 Correct 74 ms 13280 KB Output is correct
15 Correct 154 ms 19552 KB Output is correct
16 Correct 146 ms 19044 KB Output is correct
17 Correct 155 ms 19940 KB Output is correct
18 Correct 138 ms 16992 KB Output is correct
19 Incorrect 146 ms 15720 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 2 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 512 KB Output is correct
9 Correct 1 ms 504 KB Output is correct
10 Correct 70 ms 12768 KB Output is correct
11 Correct 86 ms 15200 KB Output is correct
12 Correct 84 ms 14940 KB Output is correct
13 Correct 88 ms 15844 KB Output is correct
14 Correct 67 ms 13092 KB Output is correct
15 Correct 74 ms 13280 KB Output is correct
16 Correct 154 ms 19552 KB Output is correct
17 Correct 146 ms 19044 KB Output is correct
18 Correct 155 ms 19940 KB Output is correct
19 Correct 138 ms 16992 KB Output is correct
20 Incorrect 146 ms 15720 KB Output isn't correct
21 Halted 0 ms 0 KB -