oj.uz

답안 #930957

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
930957 2024-02-20T23:58:48 Z Regulus 경주 (Race) (IOI11_race) C++17
100 / 100
 335 ms 93652 KB 
#include "race.h"
#include <bits/stdc++.h>
#define IO ios::sync_with_stdio(false);cin.tie(0);
#define debug(x) cerr << #x << " = " << (x) << ' '
#define bug(x) cerr << (x) << ' '
#define endl cerr << '\n'
#define all(v) (v).begin(), (v).end()
#define SZ(v) (ll)(v).size()
#define lowbit(x) (x)&-(x)
#define pb emplace_back
#define F first
#define S second
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
//#define TEST
const int N = 2e5+5;
const int INF = 2e9;
ll K, sum[N], dep[N], ans = INF;
vector<pll> g[N];

inline void dfs0(int x, int pre)
{
    for (pll p : g[x])
    {
        int v = p.F, w = p.S;
        if (v == pre) continue;
        sum[v] = sum[x] + w, dep[v] = dep[x] + 1;
        dfs0(v, x);
    }
}

inline void push(map<ll, int> &mp, pll p)
{
    if (mp.count(p.F)) mp[p.F] = min(mp[p.F], (int)p.S);
    else mp[p.F] = p.S;
}

inline map<ll, int> dfs(int x, int pre)
{
    map<ll, int> mp, tmp;

    for (pll e : g[x])
    {
        int v = e.F;
        if (v == pre) continue;
        tmp = dfs(v, x);
        if (SZ(tmp) > SZ(mp)) swap(mp, tmp);

        for (auto p : tmp)
        {
            if (mp.count(K-p.F + sum[x]*2))
                ans = min(ans, p.S + mp[K-p.F + sum[x]*2] - dep[x]*2);
        }
        for (auto p : tmp) push(mp, p);
    }
    if (mp.count(K + sum[x]))
        ans = min(ans, mp[K + sum[x]] - dep[x]);
    push(mp, pll{sum[x], dep[x]});

    //debug(x), endl;
    //for (auto p : mp) debug(p.F), debug(p.S), endl; endl;

    return mp;
}

int best_path(int n, int _k, int e[][2], int len[])
{
    K = _k;
    for (int i=0; i < n-1; ++i)
    {
        int x = e[i][0], y = e[i][1], w = len[i];
        ++x, ++y;
        g[x].pb(y, w), g[y].pb(x, w);
    }

    dfs0(1, 0);
    dfs(1, 0);
    ans = (ans == INF)?-1 : ans;
    return ans;
}

#ifdef TEST
int main(void)
{ IO
    int n, i;

    cin >> n >> K;
    for (i=0; i < n-1; ++i)
    {
        int x, y, w; cin >> x >> y >> w;
        ++x, ++y;
        g[x].pb(y, w), g[y].pb(x, w);
    }

    dfs0(1, 0);
    dfs(1, 0);
    //for (i=1; i <= n; ++i) bug(sum[i]); endl;
    //for (i=1; i <= n; ++i) bug(dep[i]); endl;
    //debug(ans), endl;

    if (ans == INF) cout << "-1\n";
    else cout << ans << '\n';


    return 0;
}

#endif

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10588 KB Output is correct
2 Correct 2 ms 10680 KB Output is correct
3 Correct 2 ms 10588 KB Output is correct
4 Correct 2 ms 10588 KB Output is correct
5 Correct 2 ms 10588 KB Output is correct
6 Correct 2 ms 10588 KB Output is correct
7 Correct 2 ms 10588 KB Output is correct
8 Correct 2 ms 10588 KB Output is correct
9 Correct 2 ms 10588 KB Output is correct
10 Correct 2 ms 10588 KB Output is correct
11 Correct 2 ms 10588 KB Output is correct
12 Correct 2 ms 10588 KB Output is correct
13 Correct 2 ms 10588 KB Output is correct
14 Correct 2 ms 10588 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 2 ms 10588 KB Output is correct
17 Correct 2 ms 10588 KB Output is correct
18 Correct 2 ms 10588 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10588 KB Output is correct
2 Correct 2 ms 10680 KB Output is correct
3 Correct 2 ms 10588 KB Output is correct
4 Correct 2 ms 10588 KB Output is correct
5 Correct 2 ms 10588 KB Output is correct
6 Correct 2 ms 10588 KB Output is correct
7 Correct 2 ms 10588 KB Output is correct
8 Correct 2 ms 10588 KB Output is correct
9 Correct 2 ms 10588 KB Output is correct
10 Correct 2 ms 10588 KB Output is correct
11 Correct 2 ms 10588 KB Output is correct
12 Correct 2 ms 10588 KB Output is correct
13 Correct 2 ms 10588 KB Output is correct
14 Correct 2 ms 10588 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 2 ms 10588 KB Output is correct
17 Correct 2 ms 10588 KB Output is correct
18 Correct 2 ms 10588 KB Output is correct
19 Correct 2 ms 10588 KB Output is correct
20 Correct 2 ms 10588 KB Output is correct
21 Correct 3 ms 10588 KB Output is correct
22 Correct 3 ms 10588 KB Output is correct
23 Correct 3 ms 10844 KB Output is correct
24 Correct 3 ms 10588 KB Output is correct
25 Correct 3 ms 10844 KB Output is correct
26 Correct 3 ms 10844 KB Output is correct
27 Correct 2 ms 10588 KB Output is correct
28 Correct 3 ms 10700 KB Output is correct
29 Correct 3 ms 10588 KB Output is correct
30 Correct 3 ms 10840 KB Output is correct
31 Correct 3 ms 10588 KB Output is correct
32 Correct 3 ms 10588 KB Output is correct
33 Correct 3 ms 10844 KB Output is correct
34 Correct 2 ms 10844 KB Output is correct
35 Correct 2 ms 10844 KB Output is correct
36 Correct 2 ms 10844 KB Output is correct
37 Correct 2 ms 10844 KB Output is correct
38 Correct 2 ms 10844 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10588 KB Output is correct
2 Correct 2 ms 10680 KB Output is correct
3 Correct 2 ms 10588 KB Output is correct
4 Correct 2 ms 10588 KB Output is correct
5 Correct 2 ms 10588 KB Output is correct
6 Correct 2 ms 10588 KB Output is correct
7 Correct 2 ms 10588 KB Output is correct
8 Correct 2 ms 10588 KB Output is correct
9 Correct 2 ms 10588 KB Output is correct
10 Correct 2 ms 10588 KB Output is correct
11 Correct 2 ms 10588 KB Output is correct
12 Correct 2 ms 10588 KB Output is correct
13 Correct 2 ms 10588 KB Output is correct
14 Correct 2 ms 10588 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 2 ms 10588 KB Output is correct
17 Correct 2 ms 10588 KB Output is correct
18 Correct 2 ms 10588 KB Output is correct
19 Correct 68 ms 18672 KB Output is correct
20 Correct 67 ms 19796 KB Output is correct
21 Correct 62 ms 19204 KB Output is correct
22 Correct 67 ms 19804 KB Output is correct
23 Correct 88 ms 20484 KB Output is correct
24 Correct 71 ms 19484 KB Output is correct
25 Correct 71 ms 34632 KB Output is correct
26 Correct 52 ms 47008 KB Output is correct
27 Correct 125 ms 26840 KB Output is correct
28 Correct 217 ms 93652 KB Output is correct
29 Correct 201 ms 91396 KB Output is correct
30 Correct 123 ms 27324 KB Output is correct
31 Correct 123 ms 27464 KB Output is correct
32 Correct 142 ms 27440 KB Output is correct
33 Correct 130 ms 26912 KB Output is correct
34 Correct 237 ms 39824 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10588 KB Output is correct
2 Correct 2 ms 10680 KB Output is correct
3 Correct 2 ms 10588 KB Output is correct
4 Correct 2 ms 10588 KB Output is correct
5 Correct 2 ms 10588 KB Output is correct
6 Correct 2 ms 10588 KB Output is correct
7 Correct 2 ms 10588 KB Output is correct
8 Correct 2 ms 10588 KB Output is correct
9 Correct 2 ms 10588 KB Output is correct
10 Correct 2 ms 10588 KB Output is correct
11 Correct 2 ms 10588 KB Output is correct
12 Correct 2 ms 10588 KB Output is correct
13 Correct 2 ms 10588 KB Output is correct
14 Correct 2 ms 10588 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 2 ms 10588 KB Output is correct
17 Correct 2 ms 10588 KB Output is correct
18 Correct 2 ms 10588 KB Output is correct
19 Correct 2 ms 10588 KB Output is correct
20 Correct 2 ms 10588 KB Output is correct
21 Correct 3 ms 10588 KB Output is correct
22 Correct 3 ms 10588 KB Output is correct
23 Correct 3 ms 10844 KB Output is correct
24 Correct 3 ms 10588 KB Output is correct
25 Correct 3 ms 10844 KB Output is correct
26 Correct 3 ms 10844 KB Output is correct
27 Correct 2 ms 10588 KB Output is correct
28 Correct 3 ms 10700 KB Output is correct
29 Correct 3 ms 10588 KB Output is correct
30 Correct 3 ms 10840 KB Output is correct
31 Correct 3 ms 10588 KB Output is correct
32 Correct 3 ms 10588 KB Output is correct
33 Correct 3 ms 10844 KB Output is correct
34 Correct 2 ms 10844 KB Output is correct
35 Correct 2 ms 10844 KB Output is correct
36 Correct 2 ms 10844 KB Output is correct
37 Correct 2 ms 10844 KB Output is correct
38 Correct 2 ms 10844 KB Output is correct
39 Correct 68 ms 18672 KB Output is correct
40 Correct 67 ms 19796 KB Output is correct
41 Correct 62 ms 19204 KB Output is correct
42 Correct 67 ms 19804 KB Output is correct
43 Correct 88 ms 20484 KB Output is correct
44 Correct 71 ms 19484 KB Output is correct
45 Correct 71 ms 34632 KB Output is correct
46 Correct 52 ms 47008 KB Output is correct
47 Correct 125 ms 26840 KB Output is correct
48 Correct 217 ms 93652 KB Output is correct
49 Correct 201 ms 91396 KB Output is correct
50 Correct 123 ms 27324 KB Output is correct
51 Correct 123 ms 27464 KB Output is correct
52 Correct 142 ms 27440 KB Output is correct
53 Correct 130 ms 26912 KB Output is correct
54 Correct 237 ms 39824 KB Output is correct
55 Correct 12 ms 11608 KB Output is correct
56 Correct 6 ms 11100 KB Output is correct
57 Correct 44 ms 19036 KB Output is correct
58 Correct 38 ms 18892 KB Output is correct
59 Correct 95 ms 53184 KB Output is correct
60 Correct 215 ms 91988 KB Output is correct
61 Correct 169 ms 28240 KB Output is correct
62 Correct 121 ms 27200 KB Output is correct
63 Correct 142 ms 27216 KB Output is correct
64 Correct 335 ms 33940 KB Output is correct
65 Correct 311 ms 40272 KB Output is correct
66 Correct 227 ms 81748 KB Output is correct
67 Correct 94 ms 27328 KB Output is correct
68 Correct 224 ms 37480 KB Output is correct
69 Correct 242 ms 39508 KB Output is correct
70 Correct 219 ms 36996 KB Output is correct