oj.uz

Submission #835079

# Submission time Handle Problem Language Result Execution time Memory
835079 2023-08-23T07:47:07 Z josanneo22 Cat Exercise (JOI23_ho_t4) C++17
100 / 100
 353 ms 73884 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define ld long double
#define mp make_pair
#define pb push_back
#define pii pair<int,int>
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define ar array
 
/* cat exercises:
*/
const int N=2e5+5000,K=30;
int n,h[N],f[N][K],dep[N],dp[N];
vector<int> g[N];
void setf(int u,int fa){
	f[u][0]=fa;
	for(int i=1;i<K;i++)
		f[u][i]=f[f[u][i-1]][i-1];
	for(auto&v:g[u]) if(v!=fa) setf(v,u);
	return;
}
void dfs(int u,int fa){
	dep[u]=dep[fa]+1;
	for(auto&v:g[u]) if(v!=fa) dfs(v,u);
}
int lca(int x,int y){
	if (dep[x] < dep[y]) swap(x, y);
	for(int i=27;i>=0;i--) if (dep[f[x][i]] >= dep[y]) x = f[x][i];
	if (x == y) return x;
	for(int i=27;i>=0;i--) if (f[x][i] != f[y][i]) x = f[x][i], y = f[y][i];
	return f[x][0];
}
 
vector<int> par;
void init(int sz){
	par.resize(sz);
	for(int i=0;i<sz;i++) par[i]=i;
}
int find(int x){
	if(par[x]==x) return x;
	else return par[x]=find(par[x]);
}
 
int dis(int u,int v){ return dep[u]+dep[v]-2*dep[lca(u,v)];}
void solve(){
	cin>>n;
	init(n+500);
	for(int i=1;i<=n;i++) cin>>h[i];
	for(int i=0;i<n-1;i++){
		int u,v; cin>>u>>v;
		u=h[u]; v=h[v];
		g[u].pb(v); g[v].pb(u);
	}
	setf(1,0);
	dfs(1,0);
	for(int u=1;u<=n;u++){
		for(auto&v:g[u]){
			v=find(v);
			if(v<u){
				par[v]=u;
				dp[u]=max(dp[u],dp[v]+dis(u,v));
			}
		}
	}
	cout<<dp[n]<<'\n';
}
signed main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	clock_t tStart = clock();
	int local=0,multi=0,debug=1,tt=1;
	if(local){
	    freopen("input.txt","r",stdin);
	    freopen("output.txt","w",stdout);
	}	
	if(multi) cin>>tt;
	for(int i=1;i<=tt;i++){
		if(debug && multi && local) cout<<"样例 "<<i<<'\n';
		solve();
 	}
	fprintf(stderr, "\n>> Runtime: %.10fs\n", (double) (clock() - tStart) / CLOCKS_PER_SEC);
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:76:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |      freopen("input.txt","r",stdin);
      |      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:77:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |      freopen("output.txt","w",stdout);
      |      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Correct 2 ms 5076 KB Output is correct
3 Correct 2 ms 5076 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 2 ms 5076 KB Output is correct
8 Correct 2 ms 5076 KB Output is correct
9 Correct 2 ms 5076 KB Output is correct
10 Correct 2 ms 5076 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Correct 2 ms 5076 KB Output is correct
3 Correct 2 ms 5076 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 2 ms 5076 KB Output is correct
8 Correct 2 ms 5076 KB Output is correct
9 Correct 2 ms 5076 KB Output is correct
10 Correct 2 ms 5076 KB Output is correct
11 Correct 2 ms 5204 KB Output is correct
12 Correct 2 ms 5204 KB Output is correct
13 Correct 3 ms 5184 KB Output is correct
14 Correct 3 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 2 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Correct 2 ms 5076 KB Output is correct
3 Correct 2 ms 5076 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 2 ms 5076 KB Output is correct
8 Correct 2 ms 5076 KB Output is correct
9 Correct 2 ms 5076 KB Output is correct
10 Correct 2 ms 5076 KB Output is correct
11 Correct 2 ms 5204 KB Output is correct
12 Correct 2 ms 5204 KB Output is correct
13 Correct 3 ms 5184 KB Output is correct
14 Correct 3 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 2 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct
18 Correct 6 ms 6648 KB Output is correct
19 Correct 6 ms 6868 KB Output is correct
20 Correct 6 ms 6868 KB Output is correct
21 Correct 6 ms 6740 KB Output is correct
22 Correct 6 ms 6868 KB Output is correct
23 Correct 5 ms 6740 KB Output is correct
24 Correct 5 ms 6868 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Correct 2 ms 5076 KB Output is correct
3 Correct 2 ms 5076 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 2 ms 5076 KB Output is correct
8 Correct 2 ms 5076 KB Output is correct
9 Correct 2 ms 5076 KB Output is correct
10 Correct 2 ms 5076 KB Output is correct
11 Correct 2 ms 5204 KB Output is correct
12 Correct 2 ms 5204 KB Output is correct
13 Correct 3 ms 5184 KB Output is correct
14 Correct 3 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 2 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct
18 Correct 6 ms 6648 KB Output is correct
19 Correct 6 ms 6868 KB Output is correct
20 Correct 6 ms 6868 KB Output is correct
21 Correct 6 ms 6740 KB Output is correct
22 Correct 6 ms 6868 KB Output is correct
23 Correct 5 ms 6740 KB Output is correct
24 Correct 5 ms 6868 KB Output is correct
25 Correct 2 ms 5076 KB Output is correct
26 Correct 8 ms 6740 KB Output is correct
27 Correct 5 ms 6740 KB Output is correct
28 Correct 5 ms 6740 KB Output is correct
29 Correct 6 ms 6800 KB Output is correct
30 Correct 6 ms 6612 KB Output is correct
31 Correct 6 ms 6612 KB Output is correct
32 Correct 6 ms 6612 KB Output is correct
33 Correct 6 ms 6588 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Correct 2 ms 5076 KB Output is correct
3 Correct 2 ms 5076 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 2 ms 5076 KB Output is correct
8 Correct 2 ms 5076 KB Output is correct
9 Correct 2 ms 5076 KB Output is correct
10 Correct 2 ms 5076 KB Output is correct
11 Correct 2 ms 5204 KB Output is correct
12 Correct 2 ms 5204 KB Output is correct
13 Correct 3 ms 5184 KB Output is correct
14 Correct 3 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 2 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct
18 Correct 6 ms 6648 KB Output is correct
19 Correct 6 ms 6868 KB Output is correct
20 Correct 6 ms 6868 KB Output is correct
21 Correct 6 ms 6740 KB Output is correct
22 Correct 6 ms 6868 KB Output is correct
23 Correct 5 ms 6740 KB Output is correct
24 Correct 5 ms 6868 KB Output is correct
25 Correct 254 ms 69284 KB Output is correct
26 Correct 193 ms 73852 KB Output is correct
27 Correct 200 ms 73884 KB Output is correct
28 Correct 353 ms 73440 KB Output is correct
29 Correct 329 ms 69432 KB Output is correct
30 Correct 334 ms 72308 KB Output is correct
31 Correct 337 ms 71508 KB Output is correct

Subtask #6
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Correct 2 ms 5204 KB Output is correct
3 Correct 269 ms 66204 KB Output is correct
4 Correct 274 ms 66148 KB Output is correct
5 Correct 253 ms 66108 KB Output is correct

Subtask #7
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Correct 2 ms 5076 KB Output is correct
3 Correct 2 ms 5076 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 2 ms 5076 KB Output is correct
8 Correct 2 ms 5076 KB Output is correct
9 Correct 2 ms 5076 KB Output is correct
10 Correct 2 ms 5076 KB Output is correct
11 Correct 2 ms 5204 KB Output is correct
12 Correct 2 ms 5204 KB Output is correct
13 Correct 3 ms 5184 KB Output is correct
14 Correct 3 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 2 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct
18 Correct 6 ms 6648 KB Output is correct
19 Correct 6 ms 6868 KB Output is correct
20 Correct 6 ms 6868 KB Output is correct
21 Correct 6 ms 6740 KB Output is correct
22 Correct 6 ms 6868 KB Output is correct
23 Correct 5 ms 6740 KB Output is correct
24 Correct 5 ms 6868 KB Output is correct
25 Correct 2 ms 5076 KB Output is correct
26 Correct 8 ms 6740 KB Output is correct
27 Correct 5 ms 6740 KB Output is correct
28 Correct 5 ms 6740 KB Output is correct
29 Correct 6 ms 6800 KB Output is correct
30 Correct 6 ms 6612 KB Output is correct
31 Correct 6 ms 6612 KB Output is correct
32 Correct 6 ms 6612 KB Output is correct
33 Correct 6 ms 6588 KB Output is correct
34 Correct 254 ms 69284 KB Output is correct
35 Correct 193 ms 73852 KB Output is correct
36 Correct 200 ms 73884 KB Output is correct
37 Correct 353 ms 73440 KB Output is correct
38 Correct 329 ms 69432 KB Output is correct
39 Correct 334 ms 72308 KB Output is correct
40 Correct 337 ms 71508 KB Output is correct
41 Correct 2 ms 5076 KB Output is correct
42 Correct 2 ms 5204 KB Output is correct
43 Correct 269 ms 66204 KB Output is correct
44 Correct 274 ms 66148 KB Output is correct
45 Correct 253 ms 66108 KB Output is correct
46 Correct 273 ms 71692 KB Output is correct
47 Correct 259 ms 71656 KB Output is correct
48 Correct 292 ms 71592 KB Output is correct
49 Correct 297 ms 71632 KB Output is correct
50 Correct 304 ms 65612 KB Output is correct
51 Correct 315 ms 65592 KB Output is correct
52 Correct 310 ms 65660 KB Output is correct
53 Correct 320 ms 65668 KB Output is correct