Submission #8438352


Source Code Expand

#include <iostream>
#include <vector>

using namespace std;

class union_find {
    protected :
        std::vector<int> par;
    public :
        union_find(int);
        int find(int);
        bool same(int, int);
        virtual void unite(int, int);
};

union_find::union_find(int n) {
    par.resize(n);
    for (int i=0; i<n; i++) {
        par.at(i) = i;
    }
}

int union_find::find(int x) {
    if (par.at(x) == x) return x;
    else return par.at(x) = find(par.at(x));
}

bool union_find::same(int x, int y) {
    return find(x) == find(y);
}

void union_find::unite(int x, int y) {
    int x_par = find(x);
    int y_par = find(y);
    if (x_par == y_par) return;

    par.at(x_par) = y_par;
}


int main() {
    int n = 0, m = 0;
    cin >> n >> m;
    vector<int> p(n);
    for (int i=0; i<n; i++) {
        cin >> p.at(i);
    }
    union_find uf(n);
    int x = 0, y = 0;
    for (int i=0; i<m; i++) {
        cin >> x >> y;
        uf.unite(x-1, y-1);
    }
    int cnt = 0;
    for (int i=0; i<n; i++) {
        if (uf.same(i, p.at(i)-1)) {
            cnt++;
        }
    }
    cout << cnt << endl;
    return 0;
}

Submission Info

Submission Time
Task D - Equals
User shunail
Language C++14 (GCC 5.4.1)
Score 400
Code Size 1197 Byte
Status AC
Exec Time 91 ms
Memory 1024 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 4
AC × 23
Set Name Test Cases
Sample 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt
All 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt, 1_004.txt, 1_005.txt, 1_006.txt, 1_007.txt, 1_008.txt, 1_009.txt, 1_010.txt, 1_011.txt, 1_012.txt, 1_013.txt, 1_014.txt, 1_015.txt, 1_016.txt, 1_017.txt, 1_018.txt, 1_019.txt, 1_020.txt, 1_021.txt, 1_022.txt
Case Name Status Exec Time Memory
0_000.txt AC 1 ms 256 KB
0_001.txt AC 1 ms 256 KB
0_002.txt AC 1 ms 256 KB
0_003.txt AC 1 ms 256 KB
1_004.txt AC 43 ms 256 KB
1_005.txt AC 84 ms 1024 KB
1_006.txt AC 88 ms 1024 KB
1_007.txt AC 1 ms 256 KB
1_008.txt AC 1 ms 256 KB
1_009.txt AC 1 ms 256 KB
1_010.txt AC 1 ms 256 KB
1_011.txt AC 1 ms 256 KB
1_012.txt AC 1 ms 256 KB
1_013.txt AC 1 ms 256 KB
1_014.txt AC 3 ms 256 KB
1_015.txt AC 1 ms 256 KB
1_016.txt AC 1 ms 256 KB
1_017.txt AC 2 ms 256 KB
1_018.txt AC 40 ms 256 KB
1_019.txt AC 29 ms 1024 KB
1_020.txt AC 29 ms 1024 KB
1_021.txt AC 30 ms 1024 KB
1_022.txt AC 91 ms 1024 KB