oj.uz

답안 #218610

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
218610 2020-04-02T11:37:13 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[N][N][2]; // 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[v][1][0] = 0;
    dp[v][1][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[v][j][1] = min(dp[v][j][1], dp[u.fi][i][1] + dp[v][j - i][0] + u.se);
                dp[v][j][1] = min(dp[v][j][1], dp[u.fi][i][0] + dp[v][j - i][1] + (u.se) * 2);
                
                dp[v][j][0] = min(dp[v][j][0], dp[u.fi][i][0] + dp[v][j - i][0] + (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[i][j][k] = 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[x][k][1] << 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 410 ms 783684 KB Output is correct
2 Correct 406 ms 783736 KB Output is correct
3 Correct 416 ms 783608 KB Output is correct
4 Correct 420 ms 783624 KB Output is correct
5 Correct 407 ms 783608 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 418 ms 784096 KB Output is correct
2 Correct 424 ms 784284 KB Output is correct
3 Correct 472 ms 784464 KB Output is correct
4 Correct 445 ms 784380 KB Output is correct
5 Correct 423 ms 784120 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 418 ms 784096 KB Output is correct
2 Correct 424 ms 784284 KB Output is correct
3 Correct 472 ms 784464 KB Output is correct
4 Correct 445 ms 784380 KB Output is correct
5 Correct 423 ms 784120 KB Output is correct
6 Correct 411 ms 784132 KB Output is correct
7 Correct 471 ms 784248 KB Output is correct
8 Correct 419 ms 784248 KB Output is correct
9 Correct 410 ms 784120 KB Output is correct
10 Correct 413 ms 784120 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 410 ms 783684 KB Output is correct
2 Correct 406 ms 783736 KB Output is correct
3 Correct 416 ms 783608 KB Output is correct
4 Correct 420 ms 783624 KB Output is correct
5 Correct 407 ms 783608 KB Output is correct
6 Correct 418 ms 784096 KB Output is correct
7 Correct 424 ms 784284 KB Output is correct
8 Correct 472 ms 784464 KB Output is correct
9 Correct 445 ms 784380 KB Output is correct
10 Correct 423 ms 784120 KB Output is correct
11 Correct 411 ms 784132 KB Output is correct
12 Correct 471 ms 784248 KB Output is correct
13 Correct 419 ms 784248 KB Output is correct
14 Correct 410 ms 784120 KB Output is correct
15 Correct 413 ms 784120 KB Output is correct
16 Correct 514 ms 784120 KB Output is correct
17 Correct 1214 ms 784120 KB Output is correct
18 Correct 2945 ms 784252 KB Output is correct
19 Correct 467 ms 784376 KB Output is correct
20 Correct 463 ms 784248 KB Output is correct
21 Execution timed out 3122 ms 784504 KB Time limit exceeded
22 Halted 0 ms 0 KB -