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Submission #698664

# Submission time Handle Problem Language Result Execution time Memory
698664 2023-02-14T07:24:27 Z vjudge1 Duathlon (APIO18_duathlon) C++17
10 / 100
 1000 ms 1048576 KB 
#include "bits/stdc++.h"
#define ll long long
using namespace std;
const ll mod = 1000000007;

vector<int> v[100001];
int anc[100001][20], d[100001];
int logg = 20;

void dfs(int x, int par) {
    for(int i : v[x]) {
        if(i != par) {
            anc[i][0] = x;
            d[i] = d[x] + 1;
            dfs(i, x);
        }
    }
}

int get_lca(int a, int b) {
    if(d[a] < d[b])
        swap(a, b);
    int dif = d[a] - d[b];
    for(int i = 0; i < logg; i++) {
        if(dif & (1 << i))
            a = anc[a][i];
    }
    if(a == b)
        return a;
    for(int i = logg - 1; i >= 0; i--) {
        if(anc[a][i] != anc[b][i]) {
            a = anc[a][i];
            b = anc[b][i];
        }
    }
    if(anc[a][0] == anc[b][0])
        return anc[a][0];
    return -1;
}

signed main () {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    // freopen("cowland.in","r",stdin);
    // freopen("cowland.out","w",stdout);

    int n, m;
    cin >> n >> m;
    for(int i = 0; i < m; i++) {
        int a, b;
        cin >> a >> b;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    for(int i = 1; i <= n; i++) {
        if(!anc[i][0]) {
            anc[i][0] = i;
            dfs(i, 0);
        }
    }
    for(int j = 1; j < logg; j++) {
        for(int i = 1; i <= n; i++)
            anc[i][j] = anc[anc[i][j - 1]][j - 1];
    }
    ll ans = 0;
    for(int i = 1; i <= n; i++) {
        for(int j = i + 1; j <= n; j++) {
            int lca = get_lca(i, j);
            if(lca == -1)
                continue;
            ll dis = (d[i] + d[j]) - (d[lca] * 2);
            ans += ((dis - 1) * 2LL);
        }
    }
    cout << ans;

    return 0;
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 462 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Runtime error 462 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1088 ms 404968 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 2772 KB Output is correct
2 Correct 39 ms 2772 KB Output is correct
3 Correct 41 ms 2788 KB Output is correct
4 Correct 41 ms 2836 KB Output is correct
5 Correct 48 ms 2816 KB Output is correct
6 Correct 45 ms 2812 KB Output is correct
7 Correct 46 ms 2812 KB Output is correct
8 Correct 47 ms 2772 KB Output is correct
9 Correct 47 ms 2804 KB Output is correct
10 Correct 41 ms 2688 KB Output is correct
11 Correct 88 ms 2772 KB Output is correct
12 Correct 46 ms 2772 KB Output is correct
13 Correct 47 ms 2792 KB Output is correct
14 Correct 49 ms 2772 KB Output is correct
15 Correct 47 ms 2784 KB Output is correct
16 Correct 47 ms 2772 KB Output is correct
17 Correct 35 ms 2796 KB Output is correct
18 Correct 34 ms 2772 KB Output is correct
19 Correct 36 ms 2772 KB Output is correct
20 Correct 35 ms 2772 KB Output is correct

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1062 ms 15052 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 41 ms 2772 KB Output is correct
2 Correct 40 ms 2792 KB Output is correct
3 Runtime error 935 ms 1048576 KB Execution killed with signal 9
4 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1081 ms 15260 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Runtime error 462 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 462 ms 1048576 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -