oj.uz

Submission #963239

# Submission time Handle Problem Language Result Execution time Memory
963239 2024-04-14T19:11:08 Z BhavayGoyal Election Campaign (JOI15_election_campaign) C++14
10 / 100
 135 ms 45296 KB 
#include <bits/stdc++.h>
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<class T> using oset = 
            tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define ll long long
#define ld long double
#define ar array
#define vi vector<int>
#define vii vector<vector<int>>
#define pii pair<int, int>
#define pb push_back
#define all(x) x.begin(), x.end()
#define f first
#define s second
#define endl "\n"

const int MOD = 1e9+7;
const int inf = 1e9;
const ll linf = 1e18;

const int d4i[4]={-1, 0, 1, 0}, d4j[4]={0, 1, 0, -1};
const int d8i[8]={-1, -1, 0, 1, 1, 1, 0, -1}, d8j[8]={0, 1, 1, 1, 0, -1, -1, -1};

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());


// -------------------------------------------------- Main Code --------------------------------------------------

struct fenTree {
    int n;
    vi tree;

    fenTree(int N) {n = N+5; tree = vi(n+5);}

    void update(int idx, int val) {idx++; for (idx; idx <= n; idx += (idx&-idx)) tree[idx] += val;}
    int sum(int idx) {idx++; int ans = 0; for (idx; idx; idx -= (idx&-idx)) ans += tree[idx]; return ans;}
};

const int N = 1e5+5;
vi g[N];
int parent[N][25], tin[N], tout[N], Time = 0, depth[N], dp[N][2];
vector<array<int, 3>> arr[N];
fenTree Tree(N);

void dfs2(int src, int par) {
    tin[src] = ++Time;
    parent[src][0] = par;
    for (int j = 1; j < 25; j++) parent[src][j] = parent[parent[src][j-1]][j-1];
    for (auto ch : g[src]) {
        if (ch == par) continue;
        depth[ch] = depth[src]+1;
        dfs2(ch, src);
    }
    tout[src] = ++Time;
}


int lca(int a, int b) {
    if (depth[a] > depth[b]) swap(a, b);
    int diff = depth[b]-depth[a];
    for (int j = 0; j < 25; j++) {
        if (diff&(1<<j)) b = parent[b][j];
    }

    for (int j = 24; j >= 0; j--) if (parent[a][j] != parent[b][j]) a = parent[a][j], b = parent[b][j];

    if (a == b) return a;

    return parent[a][0];
}

void dfs(int src, int par) {
    for (auto ch : g[src]) {
        if (ch == par) continue;
        dfs(ch, src);
        dp[src][0] += dp[ch][1];
    }

    dp[src][1] = dp[src][0];
    for (auto x : arr[src]) {
        int a = x[0], b = x[1], votes = x[2];
        dp[src][1] = max(dp[src][1], dp[src][0] + Tree.sum(tin[a]) + Tree.sum(tin[b]) + votes);
    }

    Tree.update(tin[src], dp[src][0]-dp[src][1]);
    Tree.update(tout[src], dp[src][1]-dp[src][0]);
}

void sol() {
    int n; cin >> n;
    for (int i = 1; i <= n-1; i++) {
        int a, b; cin >> a >> b;
        g[a].pb(b);
        g[b].pb(a);
    }

    dfs2(1, 0);

    int m; cin >> m;
    for (int i = 1; i <= m; i++) {
        int a, b, c; cin >> a >> b >> c;
        int l = lca(a, b);
        arr[l].pb({a, b, c});
    }

    dfs(1, 0);

    cout << max(dp[1][0], dp[1][1]) << endl;
}

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

    int t = 1;
    // cin >> t; 
    while (t--) {
        sol();
    }
    return 0;
}

Compilation message

election_campaign.cpp: In member function 'void fenTree::update(int, int)':
election_campaign.cpp:41:48: warning: statement has no effect [-Wunused-value]
   41 |     void update(int idx, int val) {idx++; for (idx; idx <= n; idx += (idx&-idx)) tree[idx] += val;}
      |                                                ^~~
election_campaign.cpp: In member function 'int fenTree::sum(int)':
election_campaign.cpp:42:48: warning: statement has no effect [-Wunused-value]
   42 |     int sum(int idx) {idx++; int ans = 0; for (idx; idx; idx -= (idx&-idx)) ans += tree[idx]; return ans;}
      |                                                ^~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5464 KB Output is correct
2 Correct 2 ms 5468 KB Output is correct
3 Correct 2 ms 5468 KB Output is correct
4 Correct 3 ms 5724 KB Output is correct
5 Runtime error 95 ms 41404 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5468 KB Output is correct
2 Correct 2 ms 5468 KB Output is correct
3 Correct 3 ms 5724 KB Output is correct
4 Correct 100 ms 30076 KB Output is correct
5 Correct 100 ms 30132 KB Output is correct
6 Correct 94 ms 30036 KB Output is correct
7 Correct 115 ms 30096 KB Output is correct
8 Correct 107 ms 30036 KB Output is correct
9 Correct 91 ms 30028 KB Output is correct
10 Correct 110 ms 30196 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5468 KB Output is correct
2 Correct 2 ms 5468 KB Output is correct
3 Correct 3 ms 5724 KB Output is correct
4 Correct 100 ms 30076 KB Output is correct
5 Correct 100 ms 30132 KB Output is correct
6 Correct 94 ms 30036 KB Output is correct
7 Correct 115 ms 30096 KB Output is correct
8 Correct 107 ms 30036 KB Output is correct
9 Correct 91 ms 30028 KB Output is correct
10 Correct 110 ms 30196 KB Output is correct
11 Correct 12 ms 6236 KB Output is correct
12 Correct 100 ms 30236 KB Output is correct
13 Correct 103 ms 30108 KB Output is correct
14 Correct 89 ms 30072 KB Output is correct
15 Correct 97 ms 30072 KB Output is correct
16 Correct 95 ms 30224 KB Output is correct
17 Correct 116 ms 30624 KB Output is correct
18 Correct 97 ms 30192 KB Output is correct
19 Correct 101 ms 30024 KB Output is correct
20 Correct 104 ms 30216 KB Output is correct

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Runtime error 135 ms 45296 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5464 KB Output is correct
2 Correct 2 ms 5468 KB Output is correct
3 Correct 2 ms 5468 KB Output is correct
4 Correct 3 ms 5724 KB Output is correct
5 Runtime error 95 ms 41404 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -

Subtask #6
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5464 KB Output is correct
2 Correct 2 ms 5468 KB Output is correct
3 Correct 2 ms 5468 KB Output is correct
4 Correct 3 ms 5724 KB Output is correct
5 Runtime error 95 ms 41404 KB Execution killed with signal 11
6 Halted 0 ms 0 KB -