oj.uz

Submission #1040257

# Submission time Handle Problem Language Result Execution time Memory
1040257 2024-07-31T21:02:29 Z shezitt Election Campaign (JOI15_election_campaign) C++14
100 / 100
 141 ms 57356 KB 
#include<bits/stdc++.h>

using namespace std;

using ll = long long;

#define int ll
#define fore(a, b, c) for(int a=b; a<c; ++a)
#define vi vector<int>
#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define F first
#define S second
#define ii pair<int,int>
#define dbg(x) cerr << #x << ": " << x << endl
#define raya cerr << "=============" << endl

const int N = 2e5+5;
const int LG = 20;

struct fenwick {
    int n;
    vi t;
    fenwick(int n) : n(n) {
        t.assign(n+5, 0);
    }
    void add(int i, int x){
        for(; i<=n; i+=i&-i){
            t[i] += x;
        }
    }
    int query(int i){
        int r = 0;
        for(; i>0; i-=i&-i){
            r += t[i];
        }
        return r;
    }
} bit(N-5);

vi adj[N];
vector<array<int,3>> ways[N];
int dp[N][2];
int pa[N][LG];
int dep[N];
int timer;
int entro[N], salgo[N];

int n, m;

void dfs(int at, int ante=0){
    entro[at] = ++timer;
    pa[at][0] = ante;
    for(int u : adj[at]){
        if(u == ante) continue;
        dep[u] = dep[at] + 1;
        dfs(u, at);
    }
    salgo[at] = timer;
}

int jump(int a, int k){
    fore(i, 0, LG){
        if((k >> i) & 1){
            a = pa[a][i];
        }
    }
    return a;
}

int lca(int a, int b){
    if(dep[a] > dep[b]) swap(a, b);
    b = jump(b, dep[b] - dep[a]);
    if(a == b) return a;
    for(int i=LG-1; i>=0; --i){
        if(pa[a][i] != pa[b][i]){
            a = pa[a][i];
            b = pa[b][i];
        }
    }
    return pa[a][0];
}

int f(int at, int tomo){
    int &res = dp[at][tomo];
    if(res > -1) return res;
    res = 0;

    if(tomo == 0){
        int cur = 0;
        for(int u : adj[at]){
            if(u == pa[at][0]) continue;
            cur += max(f(u, 0), f(u, 1));
        }
        res = cur;
    }

    if(tomo == 1){
        int sintomar = f(at, 0);
        int mx = sintomar;
        for(auto [a, b, c] : ways[at]){
            int tmp = bit.query(entro[a]) + bit.query(entro[b]) + c;
            mx = max(mx, sintomar + tmp);
        }
        res = mx;
        bit.add(entro[at], f(at, 0) - f(at, 1));
        bit.add(salgo[at]+1, f(at, 1) - f(at, 0));
    }

    return res;

}

signed main(){
    memset(dp, -1, sizeof dp);
    cin >> n;
    fore(i, 1, n){
        int u, v;
        cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }    

    dfs(1);
    for(int i=1; i<LG; ++i){
        for(int j=1; j<=n; ++j){
            pa[j][i] = pa[pa[j][i-1]][i-1];
        }
    }

    cin >> m;
    fore(i, 0, m){
        int a, b, c;
        cin >> a >> b >> c;
        ways[lca(a, b)].pb({a, b, c});
    }

    int ans = max(f(1, 0), f(1, 1));
    
    cout << ans << endl;

}

Compilation message

election_campaign.cpp: In function 'll f(ll, ll)':
election_campaign.cpp:102:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  102 |         for(auto [a, b, c] : ways[at]){
      |                  ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 19800 KB Output is correct
2 Correct 3 ms 19544 KB Output is correct
3 Correct 3 ms 19548 KB Output is correct
4 Correct 3 ms 19548 KB Output is correct
5 Correct 57 ms 38896 KB Output is correct
6 Correct 51 ms 53588 KB Output is correct
7 Correct 64 ms 48720 KB Output is correct
8 Correct 48 ms 38992 KB Output is correct
9 Correct 60 ms 45652 KB Output is correct
10 Correct 52 ms 38996 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 19548 KB Output is correct
2 Correct 3 ms 19548 KB Output is correct
3 Correct 3 ms 19804 KB Output is correct
4 Correct 105 ms 57172 KB Output is correct
5 Correct 105 ms 57304 KB Output is correct
6 Correct 99 ms 57168 KB Output is correct
7 Correct 108 ms 57172 KB Output is correct
8 Correct 110 ms 57168 KB Output is correct
9 Correct 99 ms 57356 KB Output is correct
10 Correct 108 ms 57172 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 19548 KB Output is correct
2 Correct 3 ms 19548 KB Output is correct
3 Correct 3 ms 19804 KB Output is correct
4 Correct 105 ms 57172 KB Output is correct
5 Correct 105 ms 57304 KB Output is correct
6 Correct 99 ms 57168 KB Output is correct
7 Correct 108 ms 57172 KB Output is correct
8 Correct 110 ms 57168 KB Output is correct
9 Correct 99 ms 57356 KB Output is correct
10 Correct 108 ms 57172 KB Output is correct
11 Correct 12 ms 20572 KB Output is correct
12 Correct 108 ms 57168 KB Output is correct
13 Correct 112 ms 57168 KB Output is correct
14 Correct 102 ms 57168 KB Output is correct
15 Correct 117 ms 57168 KB Output is correct
16 Correct 103 ms 57172 KB Output is correct
17 Correct 112 ms 57284 KB Output is correct
18 Correct 113 ms 57172 KB Output is correct
19 Correct 107 ms 57172 KB Output is correct
20 Correct 114 ms 57196 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 111 ms 41716 KB Output is correct
2 Correct 98 ms 57136 KB Output is correct
3 Correct 130 ms 51600 KB Output is correct
4 Correct 97 ms 42248 KB Output is correct
5 Correct 114 ms 50576 KB Output is correct
6 Correct 97 ms 42180 KB Output is correct
7 Correct 121 ms 49928 KB Output is correct
8 Correct 108 ms 41812 KB Output is correct
9 Correct 103 ms 57168 KB Output is correct
10 Correct 135 ms 48136 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 19800 KB Output is correct
2 Correct 3 ms 19544 KB Output is correct
3 Correct 3 ms 19548 KB Output is correct
4 Correct 3 ms 19548 KB Output is correct
5 Correct 57 ms 38896 KB Output is correct
6 Correct 51 ms 53588 KB Output is correct
7 Correct 64 ms 48720 KB Output is correct
8 Correct 48 ms 38992 KB Output is correct
9 Correct 60 ms 45652 KB Output is correct
10 Correct 52 ms 38996 KB Output is correct
11 Correct 4 ms 19544 KB Output is correct
12 Correct 3 ms 19804 KB Output is correct
13 Correct 3 ms 19548 KB Output is correct
14 Correct 3 ms 19548 KB Output is correct
15 Correct 4 ms 19548 KB Output is correct
16 Correct 3 ms 19572 KB Output is correct
17 Correct 3 ms 19800 KB Output is correct
18 Correct 3 ms 19548 KB Output is correct
19 Correct 4 ms 19548 KB Output is correct
20 Correct 4 ms 19672 KB Output is correct

Subtask #6
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 19800 KB Output is correct
2 Correct 3 ms 19544 KB Output is correct
3 Correct 3 ms 19548 KB Output is correct
4 Correct 3 ms 19548 KB Output is correct
5 Correct 57 ms 38896 KB Output is correct
6 Correct 51 ms 53588 KB Output is correct
7 Correct 64 ms 48720 KB Output is correct
8 Correct 48 ms 38992 KB Output is correct
9 Correct 60 ms 45652 KB Output is correct
10 Correct 52 ms 38996 KB Output is correct
11 Correct 3 ms 19548 KB Output is correct
12 Correct 3 ms 19548 KB Output is correct
13 Correct 3 ms 19804 KB Output is correct
14 Correct 105 ms 57172 KB Output is correct
15 Correct 105 ms 57304 KB Output is correct
16 Correct 99 ms 57168 KB Output is correct
17 Correct 108 ms 57172 KB Output is correct
18 Correct 110 ms 57168 KB Output is correct
19 Correct 99 ms 57356 KB Output is correct
20 Correct 108 ms 57172 KB Output is correct
21 Correct 12 ms 20572 KB Output is correct
22 Correct 108 ms 57168 KB Output is correct
23 Correct 112 ms 57168 KB Output is correct
24 Correct 102 ms 57168 KB Output is correct
25 Correct 117 ms 57168 KB Output is correct
26 Correct 103 ms 57172 KB Output is correct
27 Correct 112 ms 57284 KB Output is correct
28 Correct 113 ms 57172 KB Output is correct
29 Correct 107 ms 57172 KB Output is correct
30 Correct 114 ms 57196 KB Output is correct
31 Correct 111 ms 41716 KB Output is correct
32 Correct 98 ms 57136 KB Output is correct
33 Correct 130 ms 51600 KB Output is correct
34 Correct 97 ms 42248 KB Output is correct
35 Correct 114 ms 50576 KB Output is correct
36 Correct 97 ms 42180 KB Output is correct
37 Correct 121 ms 49928 KB Output is correct
38 Correct 108 ms 41812 KB Output is correct
39 Correct 103 ms 57168 KB Output is correct
40 Correct 135 ms 48136 KB Output is correct
41 Correct 4 ms 19544 KB Output is correct
42 Correct 3 ms 19804 KB Output is correct
43 Correct 3 ms 19548 KB Output is correct
44 Correct 3 ms 19548 KB Output is correct
45 Correct 4 ms 19548 KB Output is correct
46 Correct 3 ms 19572 KB Output is correct
47 Correct 3 ms 19800 KB Output is correct
48 Correct 3 ms 19548 KB Output is correct
49 Correct 4 ms 19548 KB Output is correct
50 Correct 4 ms 19672 KB Output is correct
51 Correct 113 ms 41868 KB Output is correct
52 Correct 133 ms 57172 KB Output is correct
53 Correct 141 ms 48388 KB Output is correct
54 Correct 105 ms 41800 KB Output is correct
55 Correct 111 ms 41732 KB Output is correct
56 Correct 111 ms 57172 KB Output is correct
57 Correct 126 ms 49468 KB Output is correct
58 Correct 103 ms 41972 KB Output is correct
59 Correct 109 ms 41676 KB Output is correct
60 Correct 112 ms 57168 KB Output is correct
61 Correct 114 ms 49520 KB Output is correct
62 Correct 103 ms 42284 KB Output is correct
63 Correct 109 ms 41836 KB Output is correct
64 Correct 109 ms 57168 KB Output is correct
65 Correct 130 ms 49492 KB Output is correct
66 Correct 94 ms 41804 KB Output is correct
67 Correct 117 ms 42436 KB Output is correct
68 Correct 113 ms 57172 KB Output is correct
69 Correct 120 ms 47248 KB Output is correct
70 Correct 112 ms 42180 KB Output is correct