oj.uz

Submission #648548

# Submission time Handle Problem Language Result Execution time Memory
648548 2022-10-07T01:14:41 Z BackNoob Election Campaign (JOI15_election_campaign) C++14
100 / 100
 228 ms 57932 KB 
#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define endl '\n'
#define MASK(i) (1LL << (i))
#define ull unsigned long long
#define ld long double
#define pb push_back
#define all(x) (x).begin() , (x).end()
#define BIT(x , i) ((x >> (i)) & 1)
#define TASK "task"
#define sz(s) (int) (s).size()

using namespace std;
const int mxN = 5e5 + 227;
const int inf = 1e9 + 277;
const int mod = 1e9 + 7;
const ll infll = 1e18 + 7;
const int base = 307;
const int LOG = 20;

template <typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) {a = b; return true;} return false;
}


struct FenwickTree{
	int n;
	vector<int> bit;
	FenwickTree(){}
	FenwickTree(int _n) {
		n = _n;
		bit.resize(n + 7, 0);
	}

	void update(int pos, int val)
	{
		for(; pos <= n; pos += pos & -pos) bit[pos] += val;
	}
	int getsum(int pos)
	{
		int res = 0;
		for(; pos > 0; pos -= pos & -pos) res += bit[pos];
		return res;
	}
	int getsum(int l, int r)
	{
		return getsum(r) - getsum(l - 1);
	}
} ft;

struct Query{
    int u, v, c;
};

int n;
int m;
int dp[mxN];
int sum[mxN];
int sta[mxN];
int fin[mxN];
int dep[mxN];
int par[mxN][LOG + 1];
vector<int> adj[mxN];
vector<Query> query[mxN];
int timer = 0;

void dfs_pre(int u, int p)
{
    sta[u] = ++timer;
    for(int v : adj[u]) {
        if(v == p) continue;
        dep[v] = dep[u] + 1;
        par[v][0] = u;
        dfs_pre(v, u);
    }
    fin[u] = timer;
}

int getlca(int u, int v)
{
    if(dep[u] < dep[v]) swap(u, v);

    for(int j = LOG; j >= 0; j--) if(dep[par[u][j]] >= dep[v]) u = par[u][j];

    if(u == v) return u;

    for(int j = LOG; j >= 0; j--) {
        if(par[u][j] != par[v][j]) {
            u = par[u][j];
            v = par[v][j];
        }
    }
    return par[u][0];
}

void dfs(int u, int p)
{
    vector<pair<int, int>> val;
    int ans = 0;
    for(int v : adj[u]) {
        if(v == p) continue;
        dfs(v, u);
        ans += dp[v];
        val.pb({sta[v], dp[v]});
    }

    sum[u] = ans;
    dp[u] = ans;

    sort(all(val));

    for(auto it : query[u]) {
        int newval = ans + it.c + ft.getsum(sta[it.u]) + ft.getsum(sta[it.v]);
//        int x = it.u;
//        int y = it.v;

//        while(x != u) {
//            newval += sum[x] - dp[x];
//            x = par[x][0];
//        }
//        while(y != u) {
//            newval += sum[y] - dp[y];
//            y = par[y][0];
//        }



//        int newval = ans + it.c;
//        if(it.u != u) {
//            int p = upper_bound(all(val), make_pair(sta[it.u], inf)) - val.begin();
//            newval -= val[p - 1].se;
//            newval += sum[it.u];
//        }
//        if(it.v != u) {
//            int p = upper_bound(all(val), make_pair(sta[it.v], inf)) - val.begin();
//            newval -= val[p - 1].se;
//            newval += sum[it.v];
//        }
        maximize(dp[u], newval);
    }
    ft.update(sta[u], sum[u] - dp[u]);
    ft.update(fin[u] + 1, dp[u] - sum[u]);
}

void solve()
{
    cin >> n;
    for(int i = 1; i < n; i++) {
        int u, v;
        cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }

    par[1][0] = 1;
    dfs_pre(1, -1);
    for(int j = 1; j <= LOG; j++)
    for(int i = 1; i <= n; i++)
        par[i][j] = par[par[i][j - 1]][j - 1];

    cin >> m;
    for(int i = 1; i <= m; i++) {
        int u, v, c;
        cin >> u >> v >> c;
        int lca = getlca(u, v);
        query[lca].pb({u, v, c});
    }

    ft = FenwickTree(n);
    dfs(1, -1);
    int res = 0;
    for(int i = 1; i <= n; i++) maximize(res, dp[i]);
    cout << res;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    //freopen(TASK".inp" , "r" , stdin);
    //freopen(TASK".out" , "w" , stdout);

    int tc = 1;
    //cin >> tc;
    while(tc--) {
    	solve();
    }
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 13 ms 23764 KB Output is correct
3 Correct 12 ms 23764 KB Output is correct
4 Correct 14 ms 23892 KB Output is correct
5 Correct 91 ms 37768 KB Output is correct
6 Correct 68 ms 53184 KB Output is correct
7 Correct 112 ms 47728 KB Output is correct
8 Correct 70 ms 38264 KB Output is correct
9 Correct 81 ms 44940 KB Output is correct
10 Correct 78 ms 38272 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23844 KB Output is correct
2 Correct 13 ms 23856 KB Output is correct
3 Correct 14 ms 24104 KB Output is correct
4 Correct 150 ms 55164 KB Output is correct
5 Correct 150 ms 57564 KB Output is correct
6 Correct 126 ms 57624 KB Output is correct
7 Correct 141 ms 57548 KB Output is correct
8 Correct 166 ms 57708 KB Output is correct
9 Correct 139 ms 57576 KB Output is correct
10 Correct 143 ms 57660 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23844 KB Output is correct
2 Correct 13 ms 23856 KB Output is correct
3 Correct 14 ms 24104 KB Output is correct
4 Correct 150 ms 55164 KB Output is correct
5 Correct 150 ms 57564 KB Output is correct
6 Correct 126 ms 57624 KB Output is correct
7 Correct 141 ms 57548 KB Output is correct
8 Correct 166 ms 57708 KB Output is correct
9 Correct 139 ms 57576 KB Output is correct
10 Correct 143 ms 57660 KB Output is correct
11 Correct 25 ms 24908 KB Output is correct
12 Correct 180 ms 57832 KB Output is correct
13 Correct 135 ms 57928 KB Output is correct
14 Correct 132 ms 57932 KB Output is correct
15 Correct 150 ms 57928 KB Output is correct
16 Correct 138 ms 57904 KB Output is correct
17 Correct 135 ms 57896 KB Output is correct
18 Correct 143 ms 57872 KB Output is correct
19 Correct 174 ms 57932 KB Output is correct
20 Correct 144 ms 57932 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 169 ms 39260 KB Output is correct
2 Correct 129 ms 55200 KB Output is correct
3 Correct 199 ms 52044 KB Output is correct
4 Correct 139 ms 42116 KB Output is correct
5 Correct 191 ms 50924 KB Output is correct
6 Correct 115 ms 42008 KB Output is correct
7 Correct 213 ms 50664 KB Output is correct
8 Correct 175 ms 41916 KB Output is correct
9 Correct 118 ms 57676 KB Output is correct
10 Correct 198 ms 48540 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 13 ms 23764 KB Output is correct
3 Correct 12 ms 23764 KB Output is correct
4 Correct 14 ms 23892 KB Output is correct
5 Correct 91 ms 37768 KB Output is correct
6 Correct 68 ms 53184 KB Output is correct
7 Correct 112 ms 47728 KB Output is correct
8 Correct 70 ms 38264 KB Output is correct
9 Correct 81 ms 44940 KB Output is correct
10 Correct 78 ms 38272 KB Output is correct
11 Correct 15 ms 23892 KB Output is correct
12 Correct 14 ms 24148 KB Output is correct
13 Correct 13 ms 24040 KB Output is correct
14 Correct 14 ms 24020 KB Output is correct
15 Correct 14 ms 24000 KB Output is correct
16 Correct 13 ms 24020 KB Output is correct
17 Correct 13 ms 24028 KB Output is correct
18 Correct 13 ms 24020 KB Output is correct
19 Correct 13 ms 24020 KB Output is correct
20 Correct 13 ms 24148 KB Output is correct

Subtask #6
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 13 ms 23764 KB Output is correct
3 Correct 12 ms 23764 KB Output is correct
4 Correct 14 ms 23892 KB Output is correct
5 Correct 91 ms 37768 KB Output is correct
6 Correct 68 ms 53184 KB Output is correct
7 Correct 112 ms 47728 KB Output is correct
8 Correct 70 ms 38264 KB Output is correct
9 Correct 81 ms 44940 KB Output is correct
10 Correct 78 ms 38272 KB Output is correct
11 Correct 15 ms 23844 KB Output is correct
12 Correct 13 ms 23856 KB Output is correct
13 Correct 14 ms 24104 KB Output is correct
14 Correct 150 ms 55164 KB Output is correct
15 Correct 150 ms 57564 KB Output is correct
16 Correct 126 ms 57624 KB Output is correct
17 Correct 141 ms 57548 KB Output is correct
18 Correct 166 ms 57708 KB Output is correct
19 Correct 139 ms 57576 KB Output is correct
20 Correct 143 ms 57660 KB Output is correct
21 Correct 25 ms 24908 KB Output is correct
22 Correct 180 ms 57832 KB Output is correct
23 Correct 135 ms 57928 KB Output is correct
24 Correct 132 ms 57932 KB Output is correct
25 Correct 150 ms 57928 KB Output is correct
26 Correct 138 ms 57904 KB Output is correct
27 Correct 135 ms 57896 KB Output is correct
28 Correct 143 ms 57872 KB Output is correct
29 Correct 174 ms 57932 KB Output is correct
30 Correct 144 ms 57932 KB Output is correct
31 Correct 169 ms 39260 KB Output is correct
32 Correct 129 ms 55200 KB Output is correct
33 Correct 199 ms 52044 KB Output is correct
34 Correct 139 ms 42116 KB Output is correct
35 Correct 191 ms 50924 KB Output is correct
36 Correct 115 ms 42008 KB Output is correct
37 Correct 213 ms 50664 KB Output is correct
38 Correct 175 ms 41916 KB Output is correct
39 Correct 118 ms 57676 KB Output is correct
40 Correct 198 ms 48540 KB Output is correct
41 Correct 15 ms 23892 KB Output is correct
42 Correct 14 ms 24148 KB Output is correct
43 Correct 13 ms 24040 KB Output is correct
44 Correct 14 ms 24020 KB Output is correct
45 Correct 14 ms 24000 KB Output is correct
46 Correct 13 ms 24020 KB Output is correct
47 Correct 13 ms 24028 KB Output is correct
48 Correct 13 ms 24020 KB Output is correct
49 Correct 13 ms 24020 KB Output is correct
50 Correct 13 ms 24148 KB Output is correct
51 Correct 185 ms 42216 KB Output is correct
52 Correct 129 ms 57904 KB Output is correct
53 Correct 228 ms 49112 KB Output is correct
54 Correct 139 ms 42456 KB Output is correct
55 Correct 159 ms 41960 KB Output is correct
56 Correct 132 ms 57888 KB Output is correct
57 Correct 213 ms 49996 KB Output is correct
58 Correct 116 ms 42348 KB Output is correct
59 Correct 163 ms 42084 KB Output is correct
60 Correct 167 ms 57920 KB Output is correct
61 Correct 213 ms 50380 KB Output is correct
62 Correct 125 ms 42192 KB Output is correct
63 Correct 159 ms 41708 KB Output is correct
64 Correct 138 ms 57860 KB Output is correct
65 Correct 221 ms 50076 KB Output is correct
66 Correct 136 ms 42448 KB Output is correct
67 Correct 162 ms 41860 KB Output is correct
68 Correct 151 ms 57920 KB Output is correct
69 Correct 210 ms 47848 KB Output is correct
70 Correct 137 ms 42444 KB Output is correct