oj.uz

답안 #218614

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
218614 2020-04-02T11:43:37 Z toxic_hack Museum (CEOI17_museum) C++14
80 / 100
 3000 ms 784504 KB 
// g++ -std=c++14

/*

Today might be the chance to grasp the chance to let your talent bloom.
May be tomorrow, the day after, or next year...
May be even when you are 30. I'm not sure if physique has anything to do with it
but if you think that it will never come, it probably never will.

- Tooru Oikawa.

*/


#include<bits/stdc++.h>

typedef long long ll;
typedef long double lld;
using namespace std;

#define endl "\n"
#define fi first
#define se second
#define MEMS(a,b) memset(a,b,sizeof(a))
#define _ ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define __ freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);
#define all(c) c.begin(),c.end()
#define pii pair<int, int>

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r)
{
	uniform_int_distribution<int> uid(l, r);
	return uid(rng);
}

#define tr(...) cout<<__FUNCTION__<<' '<<__LINE__<<" = ";trace(#__VA_ARGS__, __VA_ARGS__)
template<typename S, typename T>
ostream& operator<<(ostream& out,pair<S,T> const& p){out<<'('<<p.fi<<", "<<p.se<<')';return out;}

template<typename T>
ostream& operator<<(ostream& out,vector<T> const& v){
ll l=v.size();for(ll i=0;i<l-1;i++)out<<v[i]<<' ';if(l>0)out<<v[l-1];return out;}

template <typename T>
ostream &operator<<(ostream &out, set<T> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << (*i) << ' ';
    return out;
}
template <typename T>
ostream &operator<<(ostream &out, multiset<T> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << (*i) << ' ';
    return out;
}
template <typename T, typename V>
ostream &operator<<(ostream &out, map<T, V> const &v) {
    for (auto i = v.begin(); i != v.end(); i++)
        out << "\n" << (i->first) <<  ":"  << (i->second);
    return out;
}

template<typename T>
void trace(const char* name, T&& arg1){cout<<name<<" : "<<arg1<<endl;}

template<typename T, typename... Args>
void trace(const char* names, T&& arg1, Args&&... args){
const char* comma = strchr(names + 1, ',');cout.write(names, comma-names)<<" : "<<arg1<<" | ";trace(comma+1,args...);}

const int N = 1e4 + 2;
vector<vector<pii>> g(N);
int dp[2][N][N]; // 0-> for coming back, 1 -> staying
int n, k, x;
const int inf = 1e9 + 1;
int sub[N];

void dfs(int v, int p) {
    sub[v] = 1;
    dp[0][v][1] = 0;
    dp[1][v][1] = 0;
    for (auto u : g[v]) {
        if (u.fi == p) continue;
        dfs(u.fi, v);
        sub[v] += sub[u.fi];
    }
    int c = 1;
    for (auto u : g[v]) {
        if (u.fi == p) continue;
        c += sub[u.fi];
        c = min(c, k);
        for (int j = c; j > 1; j--) {
            for (int i = 0; i <= min(sub[u.fi], k) && j - i >= 0; i++) {
                dp[1][v][j] = min(dp[1][v][j], dp[1][u.fi][i] + dp[0][v][j - i] + u.se);
                dp[1][v][j] = min(dp[1][v][j], dp[0][u.fi][i] + dp[1][v][j - i] + (u.se) * 2);
                
                dp[0][v][j] = min(dp[0][v][j], dp[0][u.fi][i] + dp[0][v][j - i] + (u.se * 2));
            }
        }
    }
}

int solve() {
    for (int i = 0; i < N; i++) 
        for (int j = 0; j < N; j++) 
            for (int k = 0; k < 2; k++) 
                dp[k][i][j] = inf;

    cin >> n >> k >> x;
    for (int i = 0; i < n - 1; i++) {
        int v, u, w;
        cin >> v >> u >> w;
        g[u].push_back({v, w});
        g[v].push_back({u, w});
    }
    dfs(x, 0);
    cout << dp[1][x][k] << endl;
    return 0;
}

int32_t main(){ _
    int t;
    // cin >> t;
    t = 1;
    while (t--) solve();
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 411 ms 783608 KB Output is correct
2 Correct 428 ms 783728 KB Output is correct
3 Correct 411 ms 783736 KB Output is correct
4 Correct 441 ms 783608 KB Output is correct
5 Correct 414 ms 783736 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 452 ms 784120 KB Output is correct
2 Correct 427 ms 784248 KB Output is correct
3 Correct 475 ms 784504 KB Output is correct
4 Correct 458 ms 784396 KB Output is correct
5 Correct 437 ms 784120 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 452 ms 784120 KB Output is correct
2 Correct 427 ms 784248 KB Output is correct
3 Correct 475 ms 784504 KB Output is correct
4 Correct 458 ms 784396 KB Output is correct
5 Correct 437 ms 784120 KB Output is correct
6 Correct 423 ms 784120 KB Output is correct
7 Correct 490 ms 784504 KB Output is correct
8 Correct 428 ms 784120 KB Output is correct
9 Correct 438 ms 784248 KB Output is correct
10 Correct 428 ms 784124 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 411 ms 783608 KB Output is correct
2 Correct 428 ms 783728 KB Output is correct
3 Correct 411 ms 783736 KB Output is correct
4 Correct 441 ms 783608 KB Output is correct
5 Correct 414 ms 783736 KB Output is correct
6 Correct 452 ms 784120 KB Output is correct
7 Correct 427 ms 784248 KB Output is correct
8 Correct 475 ms 784504 KB Output is correct
9 Correct 458 ms 784396 KB Output is correct
10 Correct 437 ms 784120 KB Output is correct
11 Correct 423 ms 784120 KB Output is correct
12 Correct 490 ms 784504 KB Output is correct
13 Correct 428 ms 784120 KB Output is correct
14 Correct 438 ms 784248 KB Output is correct
15 Correct 428 ms 784124 KB Output is correct
16 Correct 509 ms 784216 KB Output is correct
17 Correct 1166 ms 784120 KB Output is correct
18 Correct 2868 ms 784376 KB Output is correct
19 Correct 495 ms 784120 KB Output is correct
20 Correct 472 ms 784120 KB Output is correct
21 Execution timed out 3136 ms 784248 KB Time limit exceeded
22 Halted 0 ms 0 KB -