oj.uz

Submission #1027865

# Submission time Handle Problem Language Result Execution time Memory
1027865 2024-07-19T10:44:24 Z KienTran Election Campaign (JOI15_election_campaign) C++14
100 / 100
 156 ms 48940 KB 
#include <bits/stdc++.h>

using namespace std;

const int O = 2e5 + 5;
const int N = (1 << 10) + 5;
const int mod = 1e9 + 7; //998244353;
const int inf = 1e9;
int pr[] = {167772161, 469762049, 754974721, 1045430273, 1051721729, 1053818881};

int n, m, Time, a[O], b[O], c[O], h[O], in[O], out[O], f[21][O], dp[2][O];
vector <int> g[O], q[O];
int tree[O * 4];

void Update(int id, int l, int r, int u, int val){
    if (l > u || r < u) return;
    if (l == r){
        tree[id] += val;
        return;
    }
    int mid = (l + r) / 2;
    Update(id << 1, l, mid, u, val);
    Update(id << 1 | 1, mid + 1, r, u, val);
    tree[id] = tree[id << 1] + tree[id << 1 | 1];
}

int Get(int id, int l, int r, int u, int v){
    if (l > v || r < u) return 0;
    if (u <= l && r <= v) return tree[id];
    int mid = (l + r) / 2;
    return Get(id << 1, l, mid, u, v) + Get(id << 1 | 1, mid + 1, r, u, v);
}

void init(int u, int par = 0){
    in[u] = ++ Time;
    for (int v : g[u]){
        if (v != par){
            h[v] = h[u] + 1;
            f[0][v] = u;
            init(v, u);
        }
    }
    out[u] = ++ Time;
}

int Lca(int u, int v){
    if (h[u] < h[v]) swap(u, v);

    for (int i = 20; i >= 0; -- i){
        if (h[u] - (1 << i) >= h[v]) u = f[i][u];
    }

    if (u == v) return u;

    for (int i = 20; i >= 0; -- i){
        if (f[i][u] != f[i][v]){
            u = f[i][u];
            v = f[i][v];
        }
    }

    return f[0][u];
}

int Jump(int u, int d){
    for (int i = 20; i >= 0; -- i){
        if (d >> i & 1) u = f[i][u];
    }
    return u;
}

void dfs(int u, int par = 0){
    dp[0][u] = dp[1][u] = 0;
    for (int v : g[u]){
        if (v != par){
            dfs(v, u);
            dp[0][u] +=  max(dp[1][v], dp[0][v]);
        }
    }

    for (int i : q[u]){
        int x = (a[i] == u) ? -1 : a[i];
        int y = (b[i] == u) ? -1 : b[i];

        int val = dp[0][u] + c[i];

        if (x != -1){
            val = val + Get(1, 1, Time, in[u], in[x]);
        }

        if (y != -1){
            val = val + Get(1, 1, Time, in[u], in[y]);
        }

        dp[1][u] = max(dp[1][u], val);
    }

    Update(1, 1, Time, in[u], dp[0][u] - max(dp[0][u], dp[1][u]));
    Update(1, 1, Time, out[u], max(dp[0][u], dp[1][u]) - dp[0][u]);
}

main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    cin >> n;
    for (int i = 1; i < n; ++ i){
        int u, v; cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }

    memset(f, -1, sizeof(f));
    init(1);

    for (int i = 1; i <= 20; ++ i){
        for (int j = 1; j <= n; ++ j){
            if (f[i - 1][j] != -1) f[i][j] = f[i - 1][f[i - 1][j]];
        }
    }

    cin >> m;
    for (int i = 1; i <= m; ++ i){
        cin >> a[i] >> b[i] >> c[i];
        int u = Lca(a[i], b[i]);
        q[u].push_back(i);
    }

    dfs(1);

    cout << max(dp[0][1], dp[1][1]);
}
/**
1
6 3
1 2 1 4 3 8
**/

Compilation message

election_campaign.cpp:102:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  102 | main(){
      | ^~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 29020 KB Output is correct
2 Correct 5 ms 28764 KB Output is correct
3 Correct 4 ms 28764 KB Output is correct
4 Correct 4 ms 29276 KB Output is correct
5 Correct 70 ms 36380 KB Output is correct
6 Correct 53 ms 43860 KB Output is correct
7 Correct 61 ms 41300 KB Output is correct
8 Correct 50 ms 36676 KB Output is correct
9 Correct 55 ms 39764 KB Output is correct
10 Correct 52 ms 36692 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 28764 KB Output is correct
2 Correct 4 ms 28764 KB Output is correct
3 Correct 5 ms 28764 KB Output is correct
4 Correct 120 ms 47516 KB Output is correct
5 Correct 120 ms 47696 KB Output is correct
6 Correct 97 ms 47592 KB Output is correct
7 Correct 119 ms 47444 KB Output is correct
8 Correct 126 ms 47640 KB Output is correct
9 Correct 98 ms 47700 KB Output is correct
10 Correct 117 ms 47444 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 28764 KB Output is correct
2 Correct 4 ms 28764 KB Output is correct
3 Correct 5 ms 28764 KB Output is correct
4 Correct 120 ms 47516 KB Output is correct
5 Correct 120 ms 47696 KB Output is correct
6 Correct 97 ms 47592 KB Output is correct
7 Correct 119 ms 47444 KB Output is correct
8 Correct 126 ms 47640 KB Output is correct
9 Correct 98 ms 47700 KB Output is correct
10 Correct 117 ms 47444 KB Output is correct
11 Correct 13 ms 29532 KB Output is correct
12 Correct 120 ms 47772 KB Output is correct
13 Correct 112 ms 47884 KB Output is correct
14 Correct 95 ms 47956 KB Output is correct
15 Correct 129 ms 47956 KB Output is correct
16 Correct 96 ms 48940 KB Output is correct
17 Correct 111 ms 47956 KB Output is correct
18 Correct 115 ms 47916 KB Output is correct
19 Correct 97 ms 47956 KB Output is correct
20 Correct 105 ms 48896 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 133 ms 39416 KB Output is correct
2 Correct 98 ms 47700 KB Output is correct
3 Correct 155 ms 44628 KB Output is correct
4 Correct 123 ms 39632 KB Output is correct
5 Correct 112 ms 45396 KB Output is correct
6 Correct 116 ms 39888 KB Output is correct
7 Correct 142 ms 43788 KB Output is correct
8 Correct 100 ms 39764 KB Output is correct
9 Correct 96 ms 47568 KB Output is correct
10 Correct 142 ms 42940 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 29020 KB Output is correct
2 Correct 5 ms 28764 KB Output is correct
3 Correct 4 ms 28764 KB Output is correct
4 Correct 4 ms 29276 KB Output is correct
5 Correct 70 ms 36380 KB Output is correct
6 Correct 53 ms 43860 KB Output is correct
7 Correct 61 ms 41300 KB Output is correct
8 Correct 50 ms 36676 KB Output is correct
9 Correct 55 ms 39764 KB Output is correct
10 Correct 52 ms 36692 KB Output is correct
11 Correct 5 ms 29276 KB Output is correct
12 Correct 5 ms 28932 KB Output is correct
13 Correct 5 ms 29276 KB Output is correct
14 Correct 5 ms 28764 KB Output is correct
15 Correct 5 ms 28704 KB Output is correct
16 Correct 5 ms 28764 KB Output is correct
17 Correct 5 ms 28764 KB Output is correct
18 Correct 5 ms 28868 KB Output is correct
19 Correct 6 ms 28764 KB Output is correct
20 Correct 5 ms 29276 KB Output is correct

Subtask #6
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 29020 KB Output is correct
2 Correct 5 ms 28764 KB Output is correct
3 Correct 4 ms 28764 KB Output is correct
4 Correct 4 ms 29276 KB Output is correct
5 Correct 70 ms 36380 KB Output is correct
6 Correct 53 ms 43860 KB Output is correct
7 Correct 61 ms 41300 KB Output is correct
8 Correct 50 ms 36676 KB Output is correct
9 Correct 55 ms 39764 KB Output is correct
10 Correct 52 ms 36692 KB Output is correct
11 Correct 4 ms 28764 KB Output is correct
12 Correct 4 ms 28764 KB Output is correct
13 Correct 5 ms 28764 KB Output is correct
14 Correct 120 ms 47516 KB Output is correct
15 Correct 120 ms 47696 KB Output is correct
16 Correct 97 ms 47592 KB Output is correct
17 Correct 119 ms 47444 KB Output is correct
18 Correct 126 ms 47640 KB Output is correct
19 Correct 98 ms 47700 KB Output is correct
20 Correct 117 ms 47444 KB Output is correct
21 Correct 13 ms 29532 KB Output is correct
22 Correct 120 ms 47772 KB Output is correct
23 Correct 112 ms 47884 KB Output is correct
24 Correct 95 ms 47956 KB Output is correct
25 Correct 129 ms 47956 KB Output is correct
26 Correct 96 ms 48940 KB Output is correct
27 Correct 111 ms 47956 KB Output is correct
28 Correct 115 ms 47916 KB Output is correct
29 Correct 97 ms 47956 KB Output is correct
30 Correct 105 ms 48896 KB Output is correct
31 Correct 133 ms 39416 KB Output is correct
32 Correct 98 ms 47700 KB Output is correct
33 Correct 155 ms 44628 KB Output is correct
34 Correct 123 ms 39632 KB Output is correct
35 Correct 112 ms 45396 KB Output is correct
36 Correct 116 ms 39888 KB Output is correct
37 Correct 142 ms 43788 KB Output is correct
38 Correct 100 ms 39764 KB Output is correct
39 Correct 96 ms 47568 KB Output is correct
40 Correct 142 ms 42940 KB Output is correct
41 Correct 5 ms 29276 KB Output is correct
42 Correct 5 ms 28932 KB Output is correct
43 Correct 5 ms 29276 KB Output is correct
44 Correct 5 ms 28764 KB Output is correct
45 Correct 5 ms 28704 KB Output is correct
46 Correct 5 ms 28764 KB Output is correct
47 Correct 5 ms 28764 KB Output is correct
48 Correct 5 ms 28868 KB Output is correct
49 Correct 6 ms 28764 KB Output is correct
50 Correct 5 ms 29276 KB Output is correct
51 Correct 112 ms 40016 KB Output is correct
52 Correct 125 ms 47700 KB Output is correct
53 Correct 156 ms 43216 KB Output is correct
54 Correct 102 ms 40020 KB Output is correct
55 Correct 130 ms 39892 KB Output is correct
56 Correct 122 ms 47956 KB Output is correct
57 Correct 123 ms 44092 KB Output is correct
58 Correct 118 ms 40020 KB Output is correct
59 Correct 100 ms 40016 KB Output is correct
60 Correct 113 ms 47956 KB Output is correct
61 Correct 118 ms 44020 KB Output is correct
62 Correct 127 ms 39984 KB Output is correct
63 Correct 133 ms 41932 KB Output is correct
64 Correct 116 ms 47836 KB Output is correct
65 Correct 146 ms 43884 KB Output is correct
66 Correct 104 ms 40184 KB Output is correct
67 Correct 124 ms 39880 KB Output is correct
68 Correct 121 ms 47956 KB Output is correct
69 Correct 131 ms 42840 KB Output is correct
70 Correct 136 ms 40068 KB Output is correct