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답안 #591407

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
591407 2022-07-07T11:58:12 Z Do_you_copy 경주 (Race) (IOI11_race) C++17
100 / 100
 523 ms 56716 KB 
#include <bits/stdc++.h>
#define taskname "test"
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using pii = pair <int, int>;
using pil = pair <int, ll>;
using pli = pair <ll, int>;
using pll = pair <ll, ll>;
using ull = unsigned ll;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());

ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

//const ll Mod = 1000000009;
//const ll Mod2 = 999999999989;
//only use when required
const int maxN = 1e6 + 1;
const int inf = 0x3f3f3f3f;
int n, k;
bool visited[maxN];
int par[maxN];
int subtree_size[maxN];
int edge[maxN];
vector <pii> adj[maxN];

int cntt = 0, cnttt = 0, total = 0;
void centroid_dfs(int u, int p){
    ++cntt;
    subtree_size[u] = 1;
    for (const auto &v: adj[u]){
        int i = v.fi;
        if (visited[i] || i == p) continue;
        centroid_dfs(i, u);
        subtree_size[u] += subtree_size[i];
    }
}

int find_centroid(int u, int p, int sz){
    ++cntt;
    for (const auto &v: adj[u]){
        int i = v.fi;
        if (visited[i] || i == p) continue;
        if (subtree_size[i] > sz / 2){
            return find_centroid(i, u, sz);
        }
    }
    return u;
}

//check if there is any "best path" traversing through the ROOT of the subtree(this case: centroid)
int find_path(int u, int p, int d, int cnt){    ++cntt;
  if (k < d) return inf;
    int tem = min(edge[k - d] + cnt, inf);
    for (const auto &i: adj[u]){
        if (visited[i.fi] || i.fi == p || i.se + d > k) continue;
        tem = min(tem, find_path(i.fi, u, i.se + d, cnt + 1));
    }
    return tem;
}

void add_path(int u, int p, int d, int cnt){ ++cntt;
    edge[d] = min(edge[d], cnt);
    for (const auto &i: adj[u]){
        if (visited[i.fi] || i.fi == p || i.se + d > k) continue;
        add_path(i.fi, u, i.se + d, cnt + 1);
    }
}

void delete_path(int u, int p, int d){
    edge[d] = inf;
    for (const auto &i: adj[u]){
        if (visited[i.fi] || i.fi == p || i.se + d > k) continue;
        delete_path(i.fi, u, i.se + d);
    }
}

int ans = inf;
int build_centroid(int u){
    cntt = cnttt = 0;
    centroid_dfs(u, -1);
    int centroid = find_centroid(u, -1, subtree_size[u]);
    //cerr << cntt << " " << total << "\n";
    visited[centroid] = 1;
    edge[0] = 0;
    for (const auto &i: adj[centroid]){
        if (visited[i.fi]) continue;
        ans = min(ans, find_path(i.fi, centroid, i.se, 1));
        add_path(i.fi, centroid, i.se, 1);
    }
    delete_path(centroid, -1, 0);
    for (const auto &i: adj[centroid]){
        if (visited[i.fi]) continue;
        par[build_centroid(i.fi)] = centroid;
    }
    return centroid;
}


int best_path(int N, int K, int H[][2], int L[]){
    n = N; k = K;
    for (int i = 0; i < n - 1; ++i){
        int u = H[i][0], v = H[i][1];
        adj[u + 1].pb({v + 1, L[i]});
        adj[v + 1].pb({u + 1, L[i]});
    }
    memset(edge, 0x3f, sizeof(edge));
    par[build_centroid(1)] = 0;
    if (ans == inf) ans = -1;
    return ans;
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 27732 KB Output is correct
2 Correct 16 ms 27708 KB Output is correct
3 Correct 16 ms 27732 KB Output is correct
4 Correct 13 ms 27644 KB Output is correct
5 Correct 14 ms 27652 KB Output is correct
6 Correct 15 ms 27732 KB Output is correct
7 Correct 14 ms 27732 KB Output is correct
8 Correct 14 ms 27708 KB Output is correct
9 Correct 14 ms 27652 KB Output is correct
10 Correct 15 ms 27732 KB Output is correct
11 Correct 16 ms 27760 KB Output is correct
12 Correct 15 ms 27636 KB Output is correct
13 Correct 14 ms 27708 KB Output is correct
14 Correct 14 ms 27756 KB Output is correct
15 Correct 14 ms 27732 KB Output is correct
16 Correct 14 ms 27732 KB Output is correct
17 Correct 14 ms 27720 KB Output is correct
18 Correct 16 ms 27704 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 27732 KB Output is correct
2 Correct 16 ms 27708 KB Output is correct
3 Correct 16 ms 27732 KB Output is correct
4 Correct 13 ms 27644 KB Output is correct
5 Correct 14 ms 27652 KB Output is correct
6 Correct 15 ms 27732 KB Output is correct
7 Correct 14 ms 27732 KB Output is correct
8 Correct 14 ms 27708 KB Output is correct
9 Correct 14 ms 27652 KB Output is correct
10 Correct 15 ms 27732 KB Output is correct
11 Correct 16 ms 27760 KB Output is correct
12 Correct 15 ms 27636 KB Output is correct
13 Correct 14 ms 27708 KB Output is correct
14 Correct 14 ms 27756 KB Output is correct
15 Correct 14 ms 27732 KB Output is correct
16 Correct 14 ms 27732 KB Output is correct
17 Correct 14 ms 27720 KB Output is correct
18 Correct 16 ms 27704 KB Output is correct
19 Correct 13 ms 27732 KB Output is correct
20 Correct 13 ms 27732 KB Output is correct
21 Correct 14 ms 27736 KB Output is correct
22 Correct 14 ms 27688 KB Output is correct
23 Correct 15 ms 27804 KB Output is correct
24 Correct 14 ms 27796 KB Output is correct
25 Correct 14 ms 27712 KB Output is correct
26 Correct 14 ms 27732 KB Output is correct
27 Correct 15 ms 27800 KB Output is correct
28 Correct 15 ms 27812 KB Output is correct
29 Correct 15 ms 27732 KB Output is correct
30 Correct 15 ms 27792 KB Output is correct
31 Correct 14 ms 27732 KB Output is correct
32 Correct 16 ms 27732 KB Output is correct
33 Correct 16 ms 27700 KB Output is correct
34 Correct 15 ms 27712 KB Output is correct
35 Correct 16 ms 27816 KB Output is correct
36 Correct 15 ms 27724 KB Output is correct
37 Correct 17 ms 27804 KB Output is correct
38 Correct 17 ms 27732 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 27732 KB Output is correct
2 Correct 16 ms 27708 KB Output is correct
3 Correct 16 ms 27732 KB Output is correct
4 Correct 13 ms 27644 KB Output is correct
5 Correct 14 ms 27652 KB Output is correct
6 Correct 15 ms 27732 KB Output is correct
7 Correct 14 ms 27732 KB Output is correct
8 Correct 14 ms 27708 KB Output is correct
9 Correct 14 ms 27652 KB Output is correct
10 Correct 15 ms 27732 KB Output is correct
11 Correct 16 ms 27760 KB Output is correct
12 Correct 15 ms 27636 KB Output is correct
13 Correct 14 ms 27708 KB Output is correct
14 Correct 14 ms 27756 KB Output is correct
15 Correct 14 ms 27732 KB Output is correct
16 Correct 14 ms 27732 KB Output is correct
17 Correct 14 ms 27720 KB Output is correct
18 Correct 16 ms 27704 KB Output is correct
19 Correct 133 ms 33436 KB Output is correct
20 Correct 135 ms 34700 KB Output is correct
21 Correct 181 ms 34816 KB Output is correct
22 Correct 127 ms 34908 KB Output is correct
23 Correct 78 ms 35132 KB Output is correct
24 Correct 63 ms 35016 KB Output is correct
25 Correct 142 ms 38384 KB Output is correct
26 Correct 99 ms 41980 KB Output is correct
27 Correct 159 ms 42244 KB Output is correct
28 Correct 243 ms 56716 KB Output is correct
29 Correct 256 ms 55660 KB Output is correct
30 Correct 161 ms 42244 KB Output is correct
31 Correct 193 ms 42208 KB Output is correct
32 Correct 208 ms 42464 KB Output is correct
33 Correct 203 ms 41124 KB Output is correct
34 Correct 187 ms 42076 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 27732 KB Output is correct
2 Correct 16 ms 27708 KB Output is correct
3 Correct 16 ms 27732 KB Output is correct
4 Correct 13 ms 27644 KB Output is correct
5 Correct 14 ms 27652 KB Output is correct
6 Correct 15 ms 27732 KB Output is correct
7 Correct 14 ms 27732 KB Output is correct
8 Correct 14 ms 27708 KB Output is correct
9 Correct 14 ms 27652 KB Output is correct
10 Correct 15 ms 27732 KB Output is correct
11 Correct 16 ms 27760 KB Output is correct
12 Correct 15 ms 27636 KB Output is correct
13 Correct 14 ms 27708 KB Output is correct
14 Correct 14 ms 27756 KB Output is correct
15 Correct 14 ms 27732 KB Output is correct
16 Correct 14 ms 27732 KB Output is correct
17 Correct 14 ms 27720 KB Output is correct
18 Correct 16 ms 27704 KB Output is correct
19 Correct 13 ms 27732 KB Output is correct
20 Correct 13 ms 27732 KB Output is correct
21 Correct 14 ms 27736 KB Output is correct
22 Correct 14 ms 27688 KB Output is correct
23 Correct 15 ms 27804 KB Output is correct
24 Correct 14 ms 27796 KB Output is correct
25 Correct 14 ms 27712 KB Output is correct
26 Correct 14 ms 27732 KB Output is correct
27 Correct 15 ms 27800 KB Output is correct
28 Correct 15 ms 27812 KB Output is correct
29 Correct 15 ms 27732 KB Output is correct
30 Correct 15 ms 27792 KB Output is correct
31 Correct 14 ms 27732 KB Output is correct
32 Correct 16 ms 27732 KB Output is correct
33 Correct 16 ms 27700 KB Output is correct
34 Correct 15 ms 27712 KB Output is correct
35 Correct 16 ms 27816 KB Output is correct
36 Correct 15 ms 27724 KB Output is correct
37 Correct 17 ms 27804 KB Output is correct
38 Correct 17 ms 27732 KB Output is correct
39 Correct 133 ms 33436 KB Output is correct
40 Correct 135 ms 34700 KB Output is correct
41 Correct 181 ms 34816 KB Output is correct
42 Correct 127 ms 34908 KB Output is correct
43 Correct 78 ms 35132 KB Output is correct
44 Correct 63 ms 35016 KB Output is correct
45 Correct 142 ms 38384 KB Output is correct
46 Correct 99 ms 41980 KB Output is correct
47 Correct 159 ms 42244 KB Output is correct
48 Correct 243 ms 56716 KB Output is correct
49 Correct 256 ms 55660 KB Output is correct
50 Correct 161 ms 42244 KB Output is correct
51 Correct 193 ms 42208 KB Output is correct
52 Correct 208 ms 42464 KB Output is correct
53 Correct 203 ms 41124 KB Output is correct
54 Correct 187 ms 42076 KB Output is correct
55 Correct 21 ms 28372 KB Output is correct
56 Correct 23 ms 28416 KB Output is correct
57 Correct 94 ms 35072 KB Output is correct
58 Correct 43 ms 34752 KB Output is correct
59 Correct 105 ms 41976 KB Output is correct
60 Correct 476 ms 55892 KB Output is correct
61 Correct 178 ms 42356 KB Output is correct
62 Correct 195 ms 42272 KB Output is correct
63 Correct 290 ms 42396 KB Output is correct
64 Correct 523 ms 42636 KB Output is correct
65 Correct 255 ms 43304 KB Output is correct
66 Correct 360 ms 53188 KB Output is correct
67 Correct 110 ms 42972 KB Output is correct
68 Correct 254 ms 43132 KB Output is correct
69 Correct 249 ms 43212 KB Output is correct
70 Correct 233 ms 42460 KB Output is correct