Submission #1086530

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086530		steveonalex	Election Campaign (JOI15_election_campaign)	C++17	10 / 100	84 ms	31056 KiB

election_campaign

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
#define block_of_code if(true)
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll gcd(ll a, ll b){return __gcd(a, b);}
ll lcm(ll a, ll b){return a / gcd(a, b) * b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
double rngesus_d(double l, double r){
    double cur = rngesus(0, MASK(60) - 1);
    cur /= MASK(60) - 1;
    return l + cur * (r - l);
}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

const int N = 1e5 + 69, LOG_N = 17;


struct FenwickTree{
    int n;
    vector<ll> a;

    FenwickTree(int _n){
        n = _n;
        a.resize(n+1);
    }

    void update(int i, ll v){
        while(i <= n){
            a[i] += v;
            i += LASTBIT(i);
        }
    }

    void update(int l, int r, ll v){
        update(l, v); update(r + 1, -v);
    }

    ll get(int i){
        ll ans = 0;
        while(i > 0){
            ans += a[i];
            i -= LASTBIT(i);
        }
        return ans;
    }
};

int n, q; 
vector<int> graph[N];
int parent[N][LOG_N], h[N];
int in[N], out[N], dfs_cnt = 0;

void dfs(int u, int p){
    in[u] = ++dfs_cnt;
    h[u] = h[p] + 1;
    for(int j = 1; MASK(j) < h[u]; ++j)
        parent[u][j] = parent[parent[u][j-1]][j-1];
    for(int v: graph[u]) if (v != p){
        parent[v][0] = u;
        dfs(v, u);
        out[u] = out[v];
    }
}

int jump(int u, int d){
    for(int j = 0; j < LOG_N; ++j) if (GETBIT(d, j)) u = parent[u][j];
    return u;
}

int LCA(int u, int v){
    if (h[u] < h[v]) swap(u, v);
    u = jump(u, h[u] - h[v]);
    if (u == v) return u;
    for(int j = LOG_N - 1; j>=0; --j) if (parent[u][j] != parent[v][j]){
        u = parent[u][j];
        v = parent[v][j];
    }
    return parent[u][0];
}

vector<array<int, 3>> queries[N];
ll dp[N], sum[N];
FenwickTree bit(N);


void go(int u, int p){
    for(int v: graph[u]) if (v != p){
        go(v, u);
        sum[u] += dp[v];
        dp[u] += dp[v];
    }

    for(array<int, 3> i: queries[u]){
        int x = i[0], y = i[1], w = i[2];
        ll ans = sum[u] + w;
        ans += bit.get(in[x]) + bit.get(in[y]) - 2 * bit.get(in[u]);
        maximize(dp[u], ans);
    }

    bit.update(in[u], out[u], sum[u] - dp[u]);
}
 
int main(void){
    ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
    clock_t start = clock();
 
    cin >> n;
    for(int i = 1; i<n; ++i){
        int u,v; cin >> u >> v;
        graph[u].push_back(v);
        graph[v].push_back(u);
    }

    dfs(1, 0);

    cin >> q;
    while(q--){
        int u, v, w; cin >> u >> v >> w;
        queries[LCA(u, v)].push_back({{u, v, w}});
    }

    go(1, 0);

    cout << dp[1] << "\n";
 
    cerr << "Time elapsed: " << clock() - start << " ms\n";
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 0 / 30
• Subtask 5: 0 / 10
• Subtask 6: 0 / 40