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Submission #1083482

# Submission time Handle Problem Language Result Execution time Memory
1083482 2024-09-03T09:40:46 Z Namviet2704 Race (IOI11_race) C++17
21 / 100
 3000 ms 28020 KB 
#include <bits/stdc++.h>
//#include "race.h"
#define ll long long
#define fi first
#define se second
#define pii pair<int, int>

using namespace std;

const int N = 2e5 + 5;

int n, k, ans = 1e9;
vector<pii> vt[N];
int in[N], out[N], pos[N], sz[N], kq[N];
pair<ll, int> h[N];
int cnt = 0;

void dfs(int u, int p)
{
    in[u] = ++cnt;
    pos[cnt] = u;
    sz[u] = 1;
    for(auto v : vt[u])
    {
        if(v.fi == p)
            continue;
        h[v.fi].fi = h[u].fi + v.se;
        h[v.fi].se = h[u].se + 1;
        dfs(v.fi, u);
        sz[u] += sz[v.fi];
    }
    out[u] = cnt;
}

map<ll, pii> mp;

void add(int u)
{
    for(int i = in[u]; i <= out[u]; i++)
    {
        if(mp[h[pos[i]].fi].fi == 0)
            mp[h[pos[i]].fi] = {h[pos[i]].se, pos[i]};
        else
            mp[h[pos[i]].fi] = min(mp[h[pos[i]].fi], {h[pos[i]].se, pos[i]});
    }
}

void del(int u)
{
    for(int i = in[u]; i <= out[u]; i++)
        mp[h[pos[i]].fi] = {0, 0};
}

void solve(int u, int p)
{
    pair<int, int> big = {0, -1};
    for(auto v : vt[u])
        if(v.fi != p)
            big = max(big, {sz[v.fi], v.fi});
    for(auto v : vt[u])
    {
        if(v.fi == big.se || v.fi == p)
            continue;
        solve(v.fi, u);
        del(v.fi);
    }
    if(big.se != -1)
        solve(big.se, u);
    for(auto v : vt[u])
        if(v.fi != big.se && v.fi != p)
            add(v.fi);
    mp[h[u].fi] = {h[u].se, u};
    for(int i = in[u]; i <= out[u]; i++)
    {
        if(big.se != -1 && in[big.se] <= i && i <= out[big.se])
            continue;
        int v = pos[i];
        ll tmp = h[u].fi + k - (h[v].fi - h[u].fi);
//        cout << u << " " << v << " " << tmp << " " << mp[tmp].fi << '\n';
        if(mp[tmp].fi == 0)
            continue;
        int haha = mp[tmp].se;
        if(out[haha] < in[v] || out[v] < in[haha] || v == u)
            ans = min(ans, h[haha].se - h[u].se + h[v].se - h[u].se);
    }
    return;
}

int best_path(int m, int g, int h[][2], int l[])
{
    n = m;
    k = g;
    for(int i = 0; i < n - 1; i++)
    {
        vt[h[i][0]].push_back({h[i][1], l[i]});
        vt[h[i][1]].push_back({h[i][0], l[i]});
    }
    dfs(0, -1);
    solve(0, -1);
    if(ans == (int) 1e9)
        return -1;
    return ans;
}

//int main()
//{
////    freopen(task".inp", "r", stdin);
////    freopen(task".out", "w", stdout);
//    ios_base::sync_with_stdio(false);
//    cin.tie(NULL), cout.tie(NULL);
//    cin >> n >> k;
//    for(int i = 1; i < n; i++)
//    {
//        int x, y, w;
//        cin >> x >> y >> w;
//        vt[x].push_back({y, w});
//        vt[y].push_back({x, w});
//    }
//    dfs(0, -1);
//    cout << best_path();
//    return 0;
//}

/*
4 3
0 1 1
1 2 2
1 3 4
11 12
0 1 3
0 2 4
2 3 5
3 4 4
4 5 6
0 6 3
6 7 2
6 8 5
8 9 6
8 10 7
*/

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4956 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Correct 3 ms 5152 KB Output is correct
5 Correct 3 ms 4956 KB Output is correct
6 Correct 2 ms 5144 KB Output is correct
7 Correct 2 ms 5212 KB Output is correct
8 Correct 2 ms 5212 KB Output is correct
9 Correct 3 ms 4956 KB Output is correct
10 Correct 2 ms 5212 KB Output is correct
11 Correct 2 ms 4956 KB Output is correct
12 Correct 2 ms 4956 KB Output is correct
13 Correct 2 ms 4956 KB Output is correct
14 Correct 2 ms 4956 KB Output is correct
15 Correct 2 ms 5212 KB Output is correct
16 Correct 2 ms 4956 KB Output is correct
17 Correct 2 ms 4956 KB Output is correct
18 Correct 2 ms 4956 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4956 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Correct 3 ms 5152 KB Output is correct
5 Correct 3 ms 4956 KB Output is correct
6 Correct 2 ms 5144 KB Output is correct
7 Correct 2 ms 5212 KB Output is correct
8 Correct 2 ms 5212 KB Output is correct
9 Correct 3 ms 4956 KB Output is correct
10 Correct 2 ms 5212 KB Output is correct
11 Correct 2 ms 4956 KB Output is correct
12 Correct 2 ms 4956 KB Output is correct
13 Correct 2 ms 4956 KB Output is correct
14 Correct 2 ms 4956 KB Output is correct
15 Correct 2 ms 5212 KB Output is correct
16 Correct 2 ms 4956 KB Output is correct
17 Correct 2 ms 4956 KB Output is correct
18 Correct 2 ms 4956 KB Output is correct
19 Correct 2 ms 4956 KB Output is correct
20 Correct 2 ms 4956 KB Output is correct
21 Correct 3 ms 5212 KB Output is correct
22 Correct 3 ms 5468 KB Output is correct
23 Correct 3 ms 5468 KB Output is correct
24 Correct 3 ms 5468 KB Output is correct
25 Correct 4 ms 5468 KB Output is correct
26 Correct 4 ms 5468 KB Output is correct
27 Correct 3 ms 5212 KB Output is correct
28 Correct 4 ms 5412 KB Output is correct
29 Correct 4 ms 5468 KB Output is correct
30 Correct 4 ms 5468 KB Output is correct
31 Correct 3 ms 5468 KB Output is correct
32 Correct 4 ms 5464 KB Output is correct
33 Correct 4 ms 5468 KB Output is correct
34 Correct 3 ms 5336 KB Output is correct
35 Correct 3 ms 5212 KB Output is correct
36 Correct 3 ms 5412 KB Output is correct
37 Correct 3 ms 5212 KB Output is correct
38 Correct 3 ms 5468 KB Output is correct

Subtask #3
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4956 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Correct 3 ms 5152 KB Output is correct
5 Correct 3 ms 4956 KB Output is correct
6 Correct 2 ms 5144 KB Output is correct
7 Correct 2 ms 5212 KB Output is correct
8 Correct 2 ms 5212 KB Output is correct
9 Correct 3 ms 4956 KB Output is correct
10 Correct 2 ms 5212 KB Output is correct
11 Correct 2 ms 4956 KB Output is correct
12 Correct 2 ms 4956 KB Output is correct
13 Correct 2 ms 4956 KB Output is correct
14 Correct 2 ms 4956 KB Output is correct
15 Correct 2 ms 5212 KB Output is correct
16 Correct 2 ms 4956 KB Output is correct
17 Correct 2 ms 4956 KB Output is correct
18 Correct 2 ms 4956 KB Output is correct
19 Correct 105 ms 14480 KB Output is correct
20 Correct 107 ms 14424 KB Output is correct
21 Correct 107 ms 14416 KB Output is correct
22 Correct 96 ms 14428 KB Output is correct
23 Correct 173 ms 14932 KB Output is correct
24 Correct 124 ms 14676 KB Output is correct
25 Correct 2790 ms 21840 KB Output is correct
26 Execution timed out 3036 ms 28020 KB Time limit exceeded
27 Halted 0 ms 0 KB -

Subtask #4
0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4956 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Correct 3 ms 5152 KB Output is correct
5 Correct 3 ms 4956 KB Output is correct
6 Correct 2 ms 5144 KB Output is correct
7 Correct 2 ms 5212 KB Output is correct
8 Correct 2 ms 5212 KB Output is correct
9 Correct 3 ms 4956 KB Output is correct
10 Correct 2 ms 5212 KB Output is correct
11 Correct 2 ms 4956 KB Output is correct
12 Correct 2 ms 4956 KB Output is correct
13 Correct 2 ms 4956 KB Output is correct
14 Correct 2 ms 4956 KB Output is correct
15 Correct 2 ms 5212 KB Output is correct
16 Correct 2 ms 4956 KB Output is correct
17 Correct 2 ms 4956 KB Output is correct
18 Correct 2 ms 4956 KB Output is correct
19 Correct 2 ms 4956 KB Output is correct
20 Correct 2 ms 4956 KB Output is correct
21 Correct 3 ms 5212 KB Output is correct
22 Correct 3 ms 5468 KB Output is correct
23 Correct 3 ms 5468 KB Output is correct
24 Correct 3 ms 5468 KB Output is correct
25 Correct 4 ms 5468 KB Output is correct
26 Correct 4 ms 5468 KB Output is correct
27 Correct 3 ms 5212 KB Output is correct
28 Correct 4 ms 5412 KB Output is correct
29 Correct 4 ms 5468 KB Output is correct
30 Correct 4 ms 5468 KB Output is correct
31 Correct 3 ms 5468 KB Output is correct
32 Correct 4 ms 5464 KB Output is correct
33 Correct 4 ms 5468 KB Output is correct
34 Correct 3 ms 5336 KB Output is correct
35 Correct 3 ms 5212 KB Output is correct
36 Correct 3 ms 5412 KB Output is correct
37 Correct 3 ms 5212 KB Output is correct
38 Correct 3 ms 5468 KB Output is correct
39 Correct 105 ms 14480 KB Output is correct
40 Correct 107 ms 14424 KB Output is correct
41 Correct 107 ms 14416 KB Output is correct
42 Correct 96 ms 14428 KB Output is correct
43 Correct 173 ms 14932 KB Output is correct
44 Correct 124 ms 14676 KB Output is correct
45 Correct 2790 ms 21840 KB Output is correct
46 Execution timed out 3036 ms 28020 KB Time limit exceeded
47 Halted 0 ms 0 KB -