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Submission #714949

# Submission time Handle Problem Language Result Execution time Memory
714949 2023-03-25T14:53:40 Z dxz05 Swapping Cities (APIO20_swap) C++17
0 / 100
 2000 ms 209592 KB 
#include "swap.h"
#include <bits/stdc++.h>

using namespace std;

const int MaxN = 100005;

int N, M;
const int blockLength = 800;

struct Set{
    int parent;
    bool line;
    pair<int, int> tail;
    Set(){};
    Set(int i){
        parent = i;
        line = true;
        tail = make_pair(i, i);
    }
};

Set t[MaxN];

int MAGIC;
bool flag[MaxN];
Set mem[MaxN][MaxN / blockLength + 4];

vector<int> re; /// Todo: change to static array

int leader(int x){
    if (MAGIC != -1 && !flag[x]){
        t[x] = (MAGIC == 0 ? Set(x) : mem[x][MAGIC - 1]);
        flag[x] = true;
        re.push_back(x);
    }
    return t[x].parent == x ? x : t[x].parent = leader(t[x].parent);
}

void unite(int x, int y){
    int X = x, Y = y;
    x = leader(x);
    y = leader(y);

    if (x == y){
        t[y].line = false;
        return;
    }

    if (rand() & 1){
        swap(x, y);
        swap(X, Y);
    }

    t[x].parent = y;
    if (!t[x].line){
        t[y].line = false;
        return;
    }

    if (!t[y].line) return;

    if (t[x].tail.first != X && t[x].tail.second != X){
        t[y].line = false;
        return;
    }

    if (t[y].tail.first != Y && t[y].tail.second != Y){
        t[y].line = false;
        return;
    }

    pair<int, int> new_tail;
    new_tail.first = t[x].tail.first ^ t[x].tail.second ^ X;
    new_tail.second = t[y].tail.first ^ t[y].tail.second ^ Y;

    t[y].tail = new_tail;
}

int el[MaxN], er[MaxN];

int blockCount;

vector<tuple<int, int, int>> edges;
void init(int _N, int _M, vector<int> U, vector<int> V, vector<int> W) {
    N = _N, M = _M;

    for (int i = 0; i < M; i++){
        edges.emplace_back(W[i], U[i], V[i]);
    }

    sort(edges.begin(), edges.end());

    for (int i = 0; i < N; i++) t[i] = Set(i);

    MAGIC = -1;
    blockCount = 0;

    for (int i = 0; i < M; i++){
        unite(U[i], V[i]);

        if ((i + 1) % blockLength == 0 || i == M - 1){
            int id = blockCount++;

            el[id] = 0, er[id] = i;
            if (id > 0) el[id] = er[id - 1] + 1;

            for (int j = 0; j < N; j++) mem[j][id] = t[leader(j)];
        }

    }

    for (int i = 0; i < N; i++) flag[i] = false;
}

bool can(int x, int y){
    x = leader(x);
    y = leader(y);
    return x == y && !t[x].line;
}

int getMinimumFuelCapacity(int X, int Y) {
    int id = 0;
    while (id < blockCount){
        int xx = mem[X][id].parent, yy = mem[Y][id].parent;
        if (xx == yy && !mem[xx][id].line){
            break;
        } else {
            id++;
        }
    }

    if (id == blockCount) return -1;

    MAGIC = id;

    int ans = -1;
    ans = get<0>(edges[er[id]]);

    re.clear();

    for (int i = el[id]; i <= er[id]; i++){
        auto [w, u, v] = edges[i];
        unite(u, v);
        if (can(X, Y)){
            ans = w;
            break;
        }
    }

    for (int i : re) flag[i] = false;

    assert(ans != -1);

    return ans;
}

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 83 ms 203732 KB Output is correct
2 Correct 81 ms 203732 KB Output is correct
3 Correct 81 ms 203792 KB Output is correct
4 Correct 82 ms 203780 KB Output is correct
5 Correct 79 ms 203804 KB Output is correct
6 Correct 85 ms 203764 KB Output is correct
7 Correct 89 ms 203880 KB Output is correct
8 Correct 83 ms 203804 KB Output is correct
9 Correct 272 ms 207680 KB Output is correct
10 Correct 362 ms 207940 KB Output is correct
11 Correct 353 ms 207932 KB Output is correct
12 Correct 422 ms 208100 KB Output is correct
13 Correct 394 ms 208124 KB Output is correct
14 Correct 276 ms 207752 KB Output is correct
15 Correct 501 ms 209504 KB Output is correct
16 Correct 494 ms 209432 KB Output is correct
17 Correct 557 ms 209580 KB Output is correct
18 Correct 553 ms 209592 KB Output is correct
19 Execution timed out 2083 ms 206524 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 83 ms 203732 KB Output is correct
2 Correct 81 ms 203732 KB Output is correct
3 Execution timed out 2074 ms 209236 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #3
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 83 ms 203732 KB Output is correct
2 Correct 81 ms 203732 KB Output is correct
3 Correct 81 ms 203792 KB Output is correct
4 Correct 82 ms 203780 KB Output is correct
5 Correct 79 ms 203804 KB Output is correct
6 Correct 85 ms 203764 KB Output is correct
7 Correct 89 ms 203880 KB Output is correct
8 Correct 83 ms 203804 KB Output is correct
9 Correct 89 ms 203796 KB Output is correct
10 Incorrect 79 ms 203768 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 89 ms 203796 KB Output is correct
2 Correct 83 ms 203732 KB Output is correct
3 Correct 81 ms 203732 KB Output is correct
4 Correct 81 ms 203792 KB Output is correct
5 Correct 82 ms 203780 KB Output is correct
6 Correct 79 ms 203804 KB Output is correct
7 Correct 85 ms 203764 KB Output is correct
8 Correct 89 ms 203880 KB Output is correct
9 Correct 83 ms 203804 KB Output is correct
10 Correct 272 ms 207680 KB Output is correct
11 Correct 362 ms 207940 KB Output is correct
12 Correct 353 ms 207932 KB Output is correct
13 Correct 422 ms 208100 KB Output is correct
14 Correct 394 ms 208124 KB Output is correct
15 Incorrect 79 ms 203768 KB Output isn't correct
16 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 83 ms 203732 KB Output is correct
2 Correct 81 ms 203732 KB Output is correct
3 Correct 81 ms 203792 KB Output is correct
4 Correct 82 ms 203780 KB Output is correct
5 Correct 79 ms 203804 KB Output is correct
6 Correct 85 ms 203764 KB Output is correct
7 Correct 89 ms 203880 KB Output is correct
8 Correct 83 ms 203804 KB Output is correct
9 Correct 272 ms 207680 KB Output is correct
10 Correct 362 ms 207940 KB Output is correct
11 Correct 353 ms 207932 KB Output is correct
12 Correct 422 ms 208100 KB Output is correct
13 Correct 394 ms 208124 KB Output is correct
14 Correct 276 ms 207752 KB Output is correct
15 Correct 501 ms 209504 KB Output is correct
16 Correct 494 ms 209432 KB Output is correct
17 Correct 557 ms 209580 KB Output is correct
18 Correct 553 ms 209592 KB Output is correct
19 Execution timed out 2074 ms 209236 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 89 ms 203796 KB Output is correct
2 Correct 83 ms 203732 KB Output is correct
3 Correct 81 ms 203732 KB Output is correct
4 Correct 81 ms 203792 KB Output is correct
5 Correct 82 ms 203780 KB Output is correct
6 Correct 79 ms 203804 KB Output is correct
7 Correct 85 ms 203764 KB Output is correct
8 Correct 89 ms 203880 KB Output is correct
9 Correct 83 ms 203804 KB Output is correct
10 Correct 272 ms 207680 KB Output is correct
11 Correct 362 ms 207940 KB Output is correct
12 Correct 353 ms 207932 KB Output is correct
13 Correct 422 ms 208100 KB Output is correct
14 Correct 394 ms 208124 KB Output is correct
15 Correct 276 ms 207752 KB Output is correct
16 Correct 501 ms 209504 KB Output is correct
17 Correct 494 ms 209432 KB Output is correct
18 Correct 557 ms 209580 KB Output is correct
19 Correct 553 ms 209592 KB Output is correct
20 Execution timed out 2074 ms 209236 KB Time limit exceeded
21 Halted 0 ms 0 KB -