oj.uz

답안 #896038

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
896038 2023-12-31T13:36:49 Z niter Cat Exercise (JOI23_ho_t4) C++14
100 / 100
 206 ms 43196 KB 
#include <bits/stdc++.h>
#define loop(i,a,b) for(int i = (a); i < (b); i ++)
#define pb push_back
#define ins insert
#define pii pair<int,int>
#define ff first
#define ss second
#define BAE(x) x.begin(), x.end()
#define op(x) cerr << #x << " = " << x << endl;
#define opa(x) cerr << #x << " = " << x << ", ";
#define ops(x) cerr << x;
#define opse(x) cerr << x << endl;
#define spac cerr << ' ';
#define entr cerr << endl;
#define STL(x) cerr << #x << " : "; for(auto &qwe:x) cerr << qwe << ' '; cerr << endl;
#define ARR(x, nnn) cerr << #x << " : "; loop(qwe,0,nnn) cerr << x[qwe] << ' '; cerr << endl;
#define bye exit(0);
using namespace std;
mt19937 RNG(chrono::steady_clock::now().time_since_epoch().count());
inline int rng(int l, int r){ return uniform_int_distribution<int>(l, r)(RNG); }
ostream& operator<<(ostream& os, pii A){ os << "[" << A.ff << ", " << A.ss << "]"; }

const int mxn = (int)(2e5) + 10;

int val[mxn], dep[mxn];
long long dp[mxn];
bool vis[mxn];
vector<int> E[mxn];
int jump[mxn][18]; // [v, x] => from v, jump 2^x times

void dfs(int v, int par, int dis){
    dep[v] = dis;
    for(auto &i:E[v]){
        if(i == par) continue;
        dfs(i, v, dis + 1);
        jump[i][0] = v;
    }
}

void init_lca(int n){
    jump[0][0] = 0;
    dfs(0, -1, 0);
    loop(j,1,18){
        loop(i,0,n){
            jump[i][j] = jump[(jump[i][j-1])][j-1];
        }
    }
}

inline int lca(int a, int b){
    if(dep[a] > dep[b]) swap(a, b);
    int diff = dep[b] - dep[a];
    loop(i,0,18){
        if((diff >> i) & 1) b = jump[b][i];
    }
    if(a == b) return b;
    for(int i = 17; i >= 0; i--){
        if(jump[a][i] != jump[b][i]){
            a = jump[a][i];
            b = jump[b][i];
        }
    }
    a = jump[a][0];
    b = jump[b][0];
    return b;
}

int fa[mxn], sz[mxn], comp_mx[mxn];
int get_father(int v){
    if(fa[fa[v]] == fa[v]) return fa[v];
    return fa[v] = get_father(fa[v]);
}
inline void merg(int x, int y){
    x = get_father(x);
    y = get_father(y);
    if(x == y) return;
    if(sz[x] < sz[y]) swap(x, y);
    sz[x] += sz[y];
    comp_mx[x] = (val[comp_mx[x]] > val[comp_mx[y]]) ? comp_mx[x] : comp_mx[y];
    fa[y] = x;
}
inline int get_comp_max(int v){
    return comp_mx[get_father(v)];
}

int main(){
    ios::sync_with_stdio(false); cin.tie(0);
    int n; cin >> n;
    loop(i,0,n) cin >> val[i];
    loop(i,0,n-1){
        int u, v;
        cin >> u >> v;
        u--; v--;
        E[u].pb(v);
        E[v].pb(u);
    }
    init_lca(n);
    loop(i,0,n){
        fa[i] = comp_mx[i] = i;
        sz[i] = 1;
    }
    vector<pii> ord_sort;
    loop(i,0,n){
        ord_sort.pb({val[i], i});
    }
    sort(BAE(ord_sort));
    vector<int> ord;
    for(auto &i:ord_sort) ord.pb(i.ss);
    long long ans = 0;
    for(auto &i:ord){
        vis[i] = true;
        for(auto &j:E[i]){
            if(vis[j]){
                int son = get_comp_max(j);
                dp[i] = max(dp[i], dp[son] + (dep[i] + dep[son] - dep[lca(i, son)] * 2));
                merg(i, j);
            }
        }
    }
    loop(i,0,n) ans = max(ans, dp[i]);
    cout << ans << '\n';
}
/*
10
5 1 10 3 8 2 4 7 9 6
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
*/

Compilation message

Main.cpp: In function 'std::ostream& operator<<(std::ostream&, std::pair<int, int>)':
Main.cpp:21:84: warning: no return statement in function returning non-void [-Wreturn-type]
   21 | ostream& operator<<(ostream& os, pii A){ os << "[" << A.ff << ", " << A.ss << "]"; }
      |                                                                                    ^

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12632 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Correct 2 ms 12636 KB Output is correct
5 Correct 2 ms 12768 KB Output is correct
6 Correct 2 ms 12636 KB Output is correct
7 Correct 2 ms 12768 KB Output is correct
8 Correct 2 ms 12772 KB Output is correct
9 Correct 2 ms 12636 KB Output is correct
10 Correct 2 ms 12636 KB Output is correct

Subtask #2
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12632 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Correct 2 ms 12636 KB Output is correct
5 Correct 2 ms 12768 KB Output is correct
6 Correct 2 ms 12636 KB Output is correct
7 Correct 2 ms 12768 KB Output is correct
8 Correct 2 ms 12772 KB Output is correct
9 Correct 2 ms 12636 KB Output is correct
10 Correct 2 ms 12636 KB Output is correct
11 Correct 2 ms 12636 KB Output is correct
12 Correct 2 ms 12636 KB Output is correct
13 Correct 2 ms 12636 KB Output is correct
14 Correct 3 ms 12636 KB Output is correct
15 Correct 3 ms 12772 KB Output is correct
16 Correct 4 ms 12636 KB Output is correct
17 Correct 3 ms 12636 KB Output is correct

Subtask #3
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12632 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Correct 2 ms 12636 KB Output is correct
5 Correct 2 ms 12768 KB Output is correct
6 Correct 2 ms 12636 KB Output is correct
7 Correct 2 ms 12768 KB Output is correct
8 Correct 2 ms 12772 KB Output is correct
9 Correct 2 ms 12636 KB Output is correct
10 Correct 2 ms 12636 KB Output is correct
11 Correct 2 ms 12636 KB Output is correct
12 Correct 2 ms 12636 KB Output is correct
13 Correct 2 ms 12636 KB Output is correct
14 Correct 3 ms 12636 KB Output is correct
15 Correct 3 ms 12772 KB Output is correct
16 Correct 4 ms 12636 KB Output is correct
17 Correct 3 ms 12636 KB Output is correct
18 Correct 4 ms 13148 KB Output is correct
19 Correct 5 ms 13292 KB Output is correct
20 Correct 5 ms 13148 KB Output is correct
21 Correct 4 ms 13148 KB Output is correct
22 Correct 5 ms 13148 KB Output is correct
23 Correct 5 ms 13148 KB Output is correct
24 Correct 4 ms 13296 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12632 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Correct 2 ms 12636 KB Output is correct
5 Correct 2 ms 12768 KB Output is correct
6 Correct 2 ms 12636 KB Output is correct
7 Correct 2 ms 12768 KB Output is correct
8 Correct 2 ms 12772 KB Output is correct
9 Correct 2 ms 12636 KB Output is correct
10 Correct 2 ms 12636 KB Output is correct
11 Correct 2 ms 12636 KB Output is correct
12 Correct 2 ms 12636 KB Output is correct
13 Correct 2 ms 12636 KB Output is correct
14 Correct 3 ms 12636 KB Output is correct
15 Correct 3 ms 12772 KB Output is correct
16 Correct 4 ms 12636 KB Output is correct
17 Correct 3 ms 12636 KB Output is correct
18 Correct 4 ms 13148 KB Output is correct
19 Correct 5 ms 13292 KB Output is correct
20 Correct 5 ms 13148 KB Output is correct
21 Correct 4 ms 13148 KB Output is correct
22 Correct 5 ms 13148 KB Output is correct
23 Correct 5 ms 13148 KB Output is correct
24 Correct 4 ms 13296 KB Output is correct
25 Correct 2 ms 12636 KB Output is correct
26 Correct 5 ms 13048 KB Output is correct
27 Correct 5 ms 13148 KB Output is correct
28 Correct 5 ms 13244 KB Output is correct
29 Correct 4 ms 13112 KB Output is correct
30 Correct 5 ms 13120 KB Output is correct
31 Correct 5 ms 13148 KB Output is correct
32 Correct 5 ms 13400 KB Output is correct
33 Correct 7 ms 9308 KB Output is correct

Subtask #5
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12632 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Correct 2 ms 12636 KB Output is correct
5 Correct 2 ms 12768 KB Output is correct
6 Correct 2 ms 12636 KB Output is correct
7 Correct 2 ms 12768 KB Output is correct
8 Correct 2 ms 12772 KB Output is correct
9 Correct 2 ms 12636 KB Output is correct
10 Correct 2 ms 12636 KB Output is correct
11 Correct 2 ms 12636 KB Output is correct
12 Correct 2 ms 12636 KB Output is correct
13 Correct 2 ms 12636 KB Output is correct
14 Correct 3 ms 12636 KB Output is correct
15 Correct 3 ms 12772 KB Output is correct
16 Correct 4 ms 12636 KB Output is correct
17 Correct 3 ms 12636 KB Output is correct
18 Correct 4 ms 13148 KB Output is correct
19 Correct 5 ms 13292 KB Output is correct
20 Correct 5 ms 13148 KB Output is correct
21 Correct 4 ms 13148 KB Output is correct
22 Correct 5 ms 13148 KB Output is correct
23 Correct 5 ms 13148 KB Output is correct
24 Correct 4 ms 13296 KB Output is correct
25 Correct 112 ms 43080 KB Output is correct
26 Correct 96 ms 42944 KB Output is correct
27 Correct 132 ms 43152 KB Output is correct
28 Correct 149 ms 43192 KB Output is correct
29 Correct 166 ms 43196 KB Output is correct
30 Correct 140 ms 43176 KB Output is correct
31 Correct 131 ms 43188 KB Output is correct

Subtask #6
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12888 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 173 ms 37940 KB Output is correct
4 Correct 145 ms 38224 KB Output is correct
5 Correct 139 ms 38064 KB Output is correct

Subtask #7
26.0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 12632 KB Output is correct
2 Correct 2 ms 12636 KB Output is correct
3 Correct 2 ms 12636 KB Output is correct
4 Correct 2 ms 12636 KB Output is correct
5 Correct 2 ms 12768 KB Output is correct
6 Correct 2 ms 12636 KB Output is correct
7 Correct 2 ms 12768 KB Output is correct
8 Correct 2 ms 12772 KB Output is correct
9 Correct 2 ms 12636 KB Output is correct
10 Correct 2 ms 12636 KB Output is correct
11 Correct 2 ms 12636 KB Output is correct
12 Correct 2 ms 12636 KB Output is correct
13 Correct 2 ms 12636 KB Output is correct
14 Correct 3 ms 12636 KB Output is correct
15 Correct 3 ms 12772 KB Output is correct
16 Correct 4 ms 12636 KB Output is correct
17 Correct 3 ms 12636 KB Output is correct
18 Correct 4 ms 13148 KB Output is correct
19 Correct 5 ms 13292 KB Output is correct
20 Correct 5 ms 13148 KB Output is correct
21 Correct 4 ms 13148 KB Output is correct
22 Correct 5 ms 13148 KB Output is correct
23 Correct 5 ms 13148 KB Output is correct
24 Correct 4 ms 13296 KB Output is correct
25 Correct 2 ms 12636 KB Output is correct
26 Correct 5 ms 13048 KB Output is correct
27 Correct 5 ms 13148 KB Output is correct
28 Correct 5 ms 13244 KB Output is correct
29 Correct 4 ms 13112 KB Output is correct
30 Correct 5 ms 13120 KB Output is correct
31 Correct 5 ms 13148 KB Output is correct
32 Correct 5 ms 13400 KB Output is correct
33 Correct 7 ms 9308 KB Output is correct
34 Correct 112 ms 43080 KB Output is correct
35 Correct 96 ms 42944 KB Output is correct
36 Correct 132 ms 43152 KB Output is correct
37 Correct 149 ms 43192 KB Output is correct
38 Correct 166 ms 43196 KB Output is correct
39 Correct 140 ms 43176 KB Output is correct
40 Correct 131 ms 43188 KB Output is correct
41 Correct 2 ms 12888 KB Output is correct
42 Correct 2 ms 12636 KB Output is correct
43 Correct 173 ms 37940 KB Output is correct
44 Correct 145 ms 38224 KB Output is correct
45 Correct 139 ms 38064 KB Output is correct
46 Correct 162 ms 41408 KB Output is correct
47 Correct 162 ms 40896 KB Output is correct
48 Correct 192 ms 41408 KB Output is correct
49 Correct 173 ms 40920 KB Output is correct
50 Correct 206 ms 38344 KB Output is correct
51 Correct 200 ms 38340 KB Output is correct
52 Correct 177 ms 38348 KB Output is correct
53 Correct 178 ms 38280 KB Output is correct