oj.uz

답안 #1097573

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1097573 2024-10-07T15:10:05 Z vjudge1 Museum (CEOI17_museum) C++17
0 / 100
 133 ms 50724 KB 
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define pb push_back
#define pa pair<int, int>
#define pall pair<ll, int>
#define fi first
#define se second
#define TASK "test"
#define Size(x) (int) x.size()
#define all(x) x.begin(), x.end()
using namespace std;

template<typename T1, typename T2> bool mini (T1 &a, T2 b) {if(a > b) a = b; else return 0; return 1;}
template<typename T1, typename T2> bool maxi (T1 &a, T2 b) {if(a < b) a = b; else return 0; return 1;}

const int MOD = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e4 + 7;
const ll oo = (ll) 1e9 + 69;

int n, k, x, u, v, w, sz[maxn], dp[maxn][maxn][2], f[maxn][maxn][2];
vector<pa> g[maxn];

void dfs(int u, int par) {
    for(auto e:g[u]) {
        int v = e.fi;
        if(v == par) continue;
        dfs(v, u);
    }

    for(int i = 0; i <= Size(g[u]); i++) {
        for(int j = 0; j <= k; j++) {
            for(int t = 0; t < 2; t++) {
                f[i][j][t] = oo;
            }
        }
    }
    f[0][1][1] = 0;
    // f[0][1][0] = 0;
    // f[0][0][0] = 0;
    // f[0][0][1] = 0;
    sz[u] = 1;

    for(int i = 1; i <= Size(g[u]); i++) {
        int v = g[u][i - 1].fi;
        int w = g[u][i - 1].se;
        if(v == par) {
            for(int j = 0; j <= sz[u]; j++) {
                for(int t = 0; t < 2; t++) {
                    f[i][j][t] = f[i - 1][j][t];
                }
            }
            continue;
        }

        for(int j = 0; j <= sz[u]; j++) {
            for(int pre = 0; pre <= sz[v]; pre++) {
                int cost = w * (pre > 0);
                mini(f[i][j + pre][0], f[i - 1][j][0] + dp[v][pre][1] + 2 * cost);
                mini(f[i][j + pre][0], f[i - 1][j][1] + dp[v][pre][0] + cost);
                mini(f[i][j + pre][1], f[i - 1][j][1] + dp[v][pre][1] + 2 * cost);
                mini(f[i][j + pre][0], f[i][j + pre][1]);
            }
        }
        sz[u] += sz[v];
    }

    for(int i = 0; i <= k; i++) {
        for(int t = 0; t < 2; t++) {
            dp[u][i][t] = f[Size(g[u])][i][t];
        }
    }
    dp[u][0][0] = dp[u][0][1] = 0;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    //freopen(TASK".inp", "r", stdin);
    //freopen(TASK".out", "w", stdout);

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

Subtask #1
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 604 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 133 ms 50724 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 133 ms 50724 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 604 KB Output isn't correct
2 Halted 0 ms 0 KB -