oj.uz

답안 #1088966

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1088966 2024-09-15T16:28:22 Z Tymond 경주 (Race) (IOI11_race) C++17
21 / 100
 3000 ms 14804 KB 
#include <bits/stdc++.h>
#include "race.h"
using namespace std;
using ll = long long;
using ld = long double;
#define fi first
#define se second
#define vi vector<int>
#define vll vector<long long>
#define pii pair<int, int>
#define pll pair<long long, long long>
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng64(chrono::steady_clock::now().time_since_epoch().count());
inline int rand(int l,int r){return uniform_int_distribution<int>(l, r)(rng);}
inline ll rand(ll l,ll r){return uniform_int_distribution<ll>(l, r)(rng64);}
#ifdef DEBUG
auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";}
#define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X)
#else
#define debug(...){}
#endif

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

const int MAXN = 2e5 + 7;
vector<pii> g[MAXN];
bool blocked[MAXN];
int sz[MAXN];
int parent[MAXN];
int n, k;
ll ans;
unordered_map<ll, ll, custom_hash> m;
vector<pll> akt;

int dfs(int v, int p){
    sz[v] = 1;
    parent[v] = p;
    for(auto ele : g[v]){
        if(ele.fi == p || blocked[ele.fi]){
            continue;
        }
        sz[v] += dfs(ele.fi, v);
    }
    return sz[v];
}

void dfs2(int v, int p, pll s){
    akt.pb(s);
    for(auto ele : g[v]){
        if(blocked[ele.fi] || p == ele.fi){
            continue;
        }
        dfs2(ele.fi, v, {s.fi + ele.se, s.se + 1});
    }
}

void centroid_decomposition(int centroid){
    int roz = dfs(centroid, centroid);

    while(true){
        bool f = 0;
        for(auto ele : g[centroid]){
            if(ele.fi == parent[centroid] || blocked[ele.fi]){
                continue;
            }
            if(sz[ele.fi] * 2 >= roz){
                centroid = ele.fi;
                break;
            }
        }
        if(!f){
            break;
        }
    }

    blocked[centroid] = 1;
    m.clear();
    m[0] = 0;
    for(auto ele : g[centroid]){
        if(blocked[ele.fi]){
            continue;
        }
        akt.clear();
        dfs2(ele.fi, ele.fi, {ele.se, 1});
        for(auto ele2 : akt){
            if(ele2.fi == k){
                ans = min(ans, ele2.se);
            }else if(ele2.fi < k){
                if(m[k - ele2.fi] != 0){
                    ans = min(ans, ele2.se + m[k - ele2.fi]);
                }
            }
        }

        for(auto ele2 : akt){
            if(m[ele2.fi] == 0){
                m[ele2.fi] = ele2.se;
            }else{
                m[ele2.fi] = min(m[ele2.fi], ele2.se);
            }
        }
    }

    for(auto ele : g[centroid]){
        if(blocked[ele.fi]){
            continue;
        }
        centroid_decomposition(ele.fi);
    }
}

int best_path(int N, int K, int H[][2], int L[]){
    ans = 1e9;
    n = N;
    k = K;
    //cout << n << ' ' << k << '\n';
    for(int i = 0; i < n - 1; i++){
        //cout << H[i][0] << ' ' << H[i][1] << ' ' << L[i] << '\n';
        g[H[i][0]].pb({H[i][1], L[i]});
        g[H[i][1]].pb({H[i][0], L[i]});
    }

    centroid_decomposition(0);
    if(ans == (ll)1e9){
        return -1;
    }
    return (int)ans;
}

/*int main(){
    int tab[3][2] = {{0, 1}, {1, 2}, {1, 3}};
    int l[3] = {1, 2, 4};
    cout << best_path(4, 3, tab, l) << '\n';
    return 0;
}*/

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 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 2 ms 4952 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 4956 KB Output is correct
7 Correct 2 ms 4956 KB Output is correct
8 Correct 2 ms 4956 KB Output is correct
9 Correct 2 ms 4956 KB Output is correct
10 Correct 2 ms 4956 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 3 ms 4956 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

# 결과 실행 시간 메모리 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 2 ms 4952 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 4956 KB Output is correct
7 Correct 2 ms 4956 KB Output is correct
8 Correct 2 ms 4956 KB Output is correct
9 Correct 2 ms 4956 KB Output is correct
10 Correct 2 ms 4956 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 3 ms 4956 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 4952 KB Output is correct
21 Correct 4 ms 5212 KB Output is correct
22 Correct 3 ms 5212 KB Output is correct
23 Correct 3 ms 5212 KB Output is correct
24 Correct 3 ms 5212 KB Output is correct
25 Correct 3 ms 5356 KB Output is correct
26 Correct 3 ms 5212 KB Output is correct
27 Correct 3 ms 5212 KB Output is correct
28 Correct 3 ms 5212 KB Output is correct
29 Correct 3 ms 5352 KB Output is correct
30 Correct 3 ms 5464 KB Output is correct
31 Correct 4 ms 5208 KB Output is correct
32 Correct 4 ms 5464 KB Output is correct
33 Correct 4 ms 5208 KB Output is correct
34 Correct 7 ms 5212 KB Output is correct
35 Correct 8 ms 5304 KB Output is correct
36 Correct 9 ms 5304 KB Output is correct
37 Correct 7 ms 5212 KB Output is correct
38 Correct 5 ms 5212 KB Output is correct

Subtask #3
0 / 22.0

# 결과 실행 시간 메모리 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 2 ms 4952 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 4956 KB Output is correct
7 Correct 2 ms 4956 KB Output is correct
8 Correct 2 ms 4956 KB Output is correct
9 Correct 2 ms 4956 KB Output is correct
10 Correct 2 ms 4956 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 3 ms 4956 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 197 ms 12964 KB Output is correct
20 Correct 201 ms 12748 KB Output is correct
21 Correct 166 ms 11876 KB Output is correct
22 Correct 145 ms 12820 KB Output is correct
23 Correct 168 ms 13012 KB Output is correct
24 Correct 96 ms 13000 KB Output is correct
25 Execution timed out 3057 ms 14804 KB Time limit exceeded
26 Halted 0 ms 0 KB -

Subtask #4
0 / 57.0

# 결과 실행 시간 메모리 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 2 ms 4952 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 4956 KB Output is correct
7 Correct 2 ms 4956 KB Output is correct
8 Correct 2 ms 4956 KB Output is correct
9 Correct 2 ms 4956 KB Output is correct
10 Correct 2 ms 4956 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 3 ms 4956 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 4952 KB Output is correct
21 Correct 4 ms 5212 KB Output is correct
22 Correct 3 ms 5212 KB Output is correct
23 Correct 3 ms 5212 KB Output is correct
24 Correct 3 ms 5212 KB Output is correct
25 Correct 3 ms 5356 KB Output is correct
26 Correct 3 ms 5212 KB Output is correct
27 Correct 3 ms 5212 KB Output is correct
28 Correct 3 ms 5212 KB Output is correct
29 Correct 3 ms 5352 KB Output is correct
30 Correct 3 ms 5464 KB Output is correct
31 Correct 4 ms 5208 KB Output is correct
32 Correct 4 ms 5464 KB Output is correct
33 Correct 4 ms 5208 KB Output is correct
34 Correct 7 ms 5212 KB Output is correct
35 Correct 8 ms 5304 KB Output is correct
36 Correct 9 ms 5304 KB Output is correct
37 Correct 7 ms 5212 KB Output is correct
38 Correct 5 ms 5212 KB Output is correct
39 Correct 197 ms 12964 KB Output is correct
40 Correct 201 ms 12748 KB Output is correct
41 Correct 166 ms 11876 KB Output is correct
42 Correct 145 ms 12820 KB Output is correct
43 Correct 168 ms 13012 KB Output is correct
44 Correct 96 ms 13000 KB Output is correct
45 Execution timed out 3057 ms 14804 KB Time limit exceeded
46 Halted 0 ms 0 KB -