oj.uz

답안 #714945

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
714945 2023-03-25T14:40:10 Z dxz05 자매 도시 (APIO20_swap) C++17
0 / 100
 104 ms 203812 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);

    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;

    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;

    return ans;
}

Subtask #1
0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 104 ms 203780 KB Output is correct
2 Incorrect 91 ms 203812 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 104 ms 203780 KB Output is correct
2 Incorrect 91 ms 203812 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 104 ms 203780 KB Output is correct
2 Incorrect 91 ms 203812 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 104 ms 203780 KB Output is correct
2 Incorrect 91 ms 203812 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 104 ms 203780 KB Output is correct
2 Incorrect 91 ms 203812 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 104 ms 203780 KB Output is correct
2 Incorrect 91 ms 203812 KB Output isn't correct
3 Halted 0 ms 0 KB -