oj.uz

답안 #519386

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
519386 2022-01-26T09:50:42 Z hoanghq2004 Chase (CEOI17_chase) C++14
100 / 100
 317 ms 268384 KB 
#include <bits/stdc++.h>
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;
using namespace std;

template <typename T>
using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;

const int N = 1e5 + 10;

int n, m;
long long in[N][110];
long long out[N][110];
int c[N];
long long tot[N];
vector <int> g[N];
long long prf[N][110], suf[N][110];
int child[N];

void down(int u, int p) {
    for (auto v: g[u]) {
        if (v == p) continue;
        down(v, u);
        for (int i = 1; i <= m; ++i)
            in[u][i] = max({in[u][i], in[v][i], in[v][i - 1] + tot[v] - c[u]});
    }
}

void up(int u, int p) {
    int num = 0;
    for (auto v: g[u]) {
        if (v == p) continue;
        child[++num] = v;
    }
    for (int i = 0; i <= m; ++i) prf[0][i] = suf[num + 1][i];
    for (int i = 1; i <= num; ++i) {
        int v = child[i];
        for (int j = 1; j <= m; ++j) {
            prf[i][j] = max({prf[i - 1][j], in[v][j], in[v][j - 1] + tot[v] - c[u]});
        }
    }
    for (int i = num; i >= 1; --i) {
        int v = child[i];
        for (int j = 1; j <= m; ++j) {
            suf[i][j] = max({suf[i + 1][j], in[v][j], in[v][j - 1] + tot[v] - c[u]});
        }
    }
    for (int i = 1; i <= num; ++i) {
        int v = child[i];
        for (int j = 1; j <= m; ++j) {
            out[v][j] = max(out[u][j], out[u][j - 1] + tot[u] - c[v]);
            out[v][j] = max({out[v][j], prf[i - 1][j], suf[i + 1][j]});
            out[v][j] = max({out[v][j], prf[i - 1][j - 1] + tot[u] - c[v], suf[i + 1][j - 1] + tot[u] - c[v]});
        }
    }
    for (auto v: g[u]) {
        if (v == p) continue;
        up(v, u);
    }
}

int main() {
    ios :: sync_with_stdio(0); cin.tie(0);
    cin >> n >> m;
    for (int i = 1; i <= n; ++i) cin >> c[i];
    for (int i = 1; i < n; ++i) {
        int u, v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    for (int u = 1; u <= n; ++u)
        for (auto v: g[u])
            tot[u] += c[v];
    down(1, 0);
    up(1, 0);
    long long ans = 0;
    for (int u = 1; u <= n; ++u) {
        ans = max({ans, in[u][m], out[u][m]});
        for (int i = 0; i < m; ++i) {
            ans = max({ans, in[u][i] + tot[u], out[u][i] + tot[u]});
        }
    }
    cout << ans;
}

Compilation message

chase.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization ("O3")
      | 
chase.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    3 | #pragma GCC optimization ("unroll-loops")
      |

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2680 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 2 ms 2676 KB Output is correct
6 Correct 1 ms 2636 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2680 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 2 ms 2676 KB Output is correct
6 Correct 1 ms 2636 KB Output is correct
7 Correct 4 ms 4044 KB Output is correct
8 Correct 3 ms 4100 KB Output is correct
9 Correct 5 ms 5240 KB Output is correct
10 Correct 4 ms 4300 KB Output is correct
11 Correct 4 ms 4356 KB Output is correct
12 Correct 4 ms 4300 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 245 ms 143852 KB Output is correct
2 Correct 238 ms 143804 KB Output is correct
3 Correct 253 ms 268384 KB Output is correct
4 Correct 150 ms 165964 KB Output is correct
5 Correct 315 ms 168300 KB Output is correct
6 Correct 301 ms 168424 KB Output is correct
7 Correct 301 ms 168264 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 2 ms 2680 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 2 ms 2676 KB Output is correct
6 Correct 1 ms 2636 KB Output is correct
7 Correct 4 ms 4044 KB Output is correct
8 Correct 3 ms 4100 KB Output is correct
9 Correct 5 ms 5240 KB Output is correct
10 Correct 4 ms 4300 KB Output is correct
11 Correct 4 ms 4356 KB Output is correct
12 Correct 4 ms 4300 KB Output is correct
13 Correct 245 ms 143852 KB Output is correct
14 Correct 238 ms 143804 KB Output is correct
15 Correct 253 ms 268384 KB Output is correct
16 Correct 150 ms 165964 KB Output is correct
17 Correct 315 ms 168300 KB Output is correct
18 Correct 301 ms 168424 KB Output is correct
19 Correct 301 ms 168264 KB Output is correct
20 Correct 311 ms 168236 KB Output is correct
21 Correct 80 ms 9484 KB Output is correct
22 Correct 317 ms 168132 KB Output is correct
23 Correct 160 ms 166084 KB Output is correct
24 Correct 301 ms 168332 KB Output is correct
25 Correct 257 ms 267896 KB Output is correct
26 Correct 243 ms 143876 KB Output is correct
27 Correct 237 ms 143836 KB Output is correct