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Submission #835060

# Submission time Handle Problem Language Result Execution time Memory
835060 2023-08-23T07:24:49 Z josanneo22 Cat Exercise (JOI23_ho_t4) C++17
31 / 100
 15 ms 11220 KB 
#include <bits/stdc++.h>
using namespace std;

#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=1e5+5000,K=25;
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];
	return;
}
void dfs(int u,int fa){
	setf(u,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=20;i>=0;i--) if (dep[f[x][i]] >= dep[y]) x = f[x][i];
	if (x == y) return x;
	for(int i=20;i>=0;i--) if (f[x][i] != f[y][i]) x = f[x][i], y = f[y][i];
	return f[x][0];
}

struct dsu{
	vector<int> par,sz;
	int total_groups;
	void init(int n){
		par.resize(n); sz.resize(n);
		for(int i=0;i<n;i++){
			par[i]=i;
			sz[i]=1;
		}
	}
	int find(int x){
		if(par[x]==x) return x;
		else return par[x]=find(par[x]);
	}
	void unite(int x, int y) {
		x = find(x);
		y = find(y);
		if (x == y) return;
		if (sz[x] < sz[y]) swap(x, y);
		par[y] = x;
		sz[x] += sz[y];
		total_groups--;
	}
	bool same(int x,int y){
		x = find(x);
		y = find(y);
		if(x==y) return true;
		else return false;
	}
};
//dsu ds; ds.init(n+5); ds.find(x); ds.unite(x,y); ds.same(x,y);

int dis(int u,int v){ return dep[u]+dep[v]-2*dep[lca(u,v)];}
void solve(){
	cin>>n;
	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);
	}
	dsu ds; ds.init(n+5);
	dfs(1,0);
	for(int u=1;u<=n;u++){
		for(auto&v:g[u]){
			v=ds.find(v);
			if(v<u){
				ds.par[v]=u;
				dp[u]=max(dp[u],dp[v]+dis(u,v));
			}
		}
	}
	cout<<*max_element(dp+1,dp+1+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:95:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |      freopen("input.txt","r",stdin);
      |      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:96:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |      freopen("output.txt","w",stdout);
      |      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2772 KB Output is correct
2 Correct 1 ms 2772 KB Output is correct
3 Correct 2 ms 2772 KB Output is correct
4 Correct 1 ms 2784 KB Output is correct
5 Correct 1 ms 2772 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 1 ms 2772 KB Output is correct
8 Correct 2 ms 2772 KB Output is correct
9 Correct 1 ms 2772 KB Output is correct
10 Correct 1 ms 2772 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2772 KB Output is correct
2 Correct 1 ms 2772 KB Output is correct
3 Correct 2 ms 2772 KB Output is correct
4 Correct 1 ms 2784 KB Output is correct
5 Correct 1 ms 2772 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 1 ms 2772 KB Output is correct
8 Correct 2 ms 2772 KB Output is correct
9 Correct 1 ms 2772 KB Output is correct
10 Correct 1 ms 2772 KB Output is correct
11 Correct 2 ms 2772 KB Output is correct
12 Correct 2 ms 2772 KB Output is correct
13 Correct 2 ms 2772 KB Output is correct
14 Correct 2 ms 2772 KB Output is correct
15 Correct 1 ms 2772 KB Output is correct
16 Correct 2 ms 2772 KB Output is correct
17 Correct 2 ms 2772 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2772 KB Output is correct
2 Correct 1 ms 2772 KB Output is correct
3 Correct 2 ms 2772 KB Output is correct
4 Correct 1 ms 2784 KB Output is correct
5 Correct 1 ms 2772 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 1 ms 2772 KB Output is correct
8 Correct 2 ms 2772 KB Output is correct
9 Correct 1 ms 2772 KB Output is correct
10 Correct 1 ms 2772 KB Output is correct
11 Correct 2 ms 2772 KB Output is correct
12 Correct 2 ms 2772 KB Output is correct
13 Correct 2 ms 2772 KB Output is correct
14 Correct 2 ms 2772 KB Output is correct
15 Correct 1 ms 2772 KB Output is correct
16 Correct 2 ms 2772 KB Output is correct
17 Correct 2 ms 2772 KB Output is correct
18 Correct 5 ms 3668 KB Output is correct
19 Correct 4 ms 3668 KB Output is correct
20 Correct 4 ms 3668 KB Output is correct
21 Correct 4 ms 3668 KB Output is correct
22 Correct 4 ms 3668 KB Output is correct
23 Correct 5 ms 3668 KB Output is correct
24 Correct 4 ms 3668 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2772 KB Output is correct
2 Correct 1 ms 2772 KB Output is correct
3 Correct 2 ms 2772 KB Output is correct
4 Correct 1 ms 2784 KB Output is correct
5 Correct 1 ms 2772 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 1 ms 2772 KB Output is correct
8 Correct 2 ms 2772 KB Output is correct
9 Correct 1 ms 2772 KB Output is correct
10 Correct 1 ms 2772 KB Output is correct
11 Correct 2 ms 2772 KB Output is correct
12 Correct 2 ms 2772 KB Output is correct
13 Correct 2 ms 2772 KB Output is correct
14 Correct 2 ms 2772 KB Output is correct
15 Correct 1 ms 2772 KB Output is correct
16 Correct 2 ms 2772 KB Output is correct
17 Correct 2 ms 2772 KB Output is correct
18 Correct 5 ms 3668 KB Output is correct
19 Correct 4 ms 3668 KB Output is correct
20 Correct 4 ms 3668 KB Output is correct
21 Correct 4 ms 3668 KB Output is correct
22 Correct 4 ms 3668 KB Output is correct
23 Correct 5 ms 3668 KB Output is correct
24 Correct 4 ms 3668 KB Output is correct
25 Correct 2 ms 2772 KB Output is correct
26 Correct 4 ms 3668 KB Output is correct
27 Correct 4 ms 3668 KB Output is correct
28 Correct 4 ms 3668 KB Output is correct
29 Correct 4 ms 3668 KB Output is correct
30 Correct 4 ms 3540 KB Output is correct
31 Correct 4 ms 3540 KB Output is correct
32 Correct 4 ms 3540 KB Output is correct
33 Correct 4 ms 3540 KB Output is correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2772 KB Output is correct
2 Correct 1 ms 2772 KB Output is correct
3 Correct 2 ms 2772 KB Output is correct
4 Correct 1 ms 2784 KB Output is correct
5 Correct 1 ms 2772 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 1 ms 2772 KB Output is correct
8 Correct 2 ms 2772 KB Output is correct
9 Correct 1 ms 2772 KB Output is correct
10 Correct 1 ms 2772 KB Output is correct
11 Correct 2 ms 2772 KB Output is correct
12 Correct 2 ms 2772 KB Output is correct
13 Correct 2 ms 2772 KB Output is correct
14 Correct 2 ms 2772 KB Output is correct
15 Correct 1 ms 2772 KB Output is correct
16 Correct 2 ms 2772 KB Output is correct
17 Correct 2 ms 2772 KB Output is correct
18 Correct 5 ms 3668 KB Output is correct
19 Correct 4 ms 3668 KB Output is correct
20 Correct 4 ms 3668 KB Output is correct
21 Correct 4 ms 3668 KB Output is correct
22 Correct 4 ms 3668 KB Output is correct
23 Correct 5 ms 3668 KB Output is correct
24 Correct 4 ms 3668 KB Output is correct
25 Runtime error 15 ms 11220 KB Execution killed with signal 11
26 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2772 KB Output is correct
2 Correct 2 ms 2772 KB Output is correct
3 Runtime error 11 ms 6356 KB Execution killed with signal 11
4 Halted 0 ms 0 KB -

Subtask #7
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2772 KB Output is correct
2 Correct 1 ms 2772 KB Output is correct
3 Correct 2 ms 2772 KB Output is correct
4 Correct 1 ms 2784 KB Output is correct
5 Correct 1 ms 2772 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 1 ms 2772 KB Output is correct
8 Correct 2 ms 2772 KB Output is correct
9 Correct 1 ms 2772 KB Output is correct
10 Correct 1 ms 2772 KB Output is correct
11 Correct 2 ms 2772 KB Output is correct
12 Correct 2 ms 2772 KB Output is correct
13 Correct 2 ms 2772 KB Output is correct
14 Correct 2 ms 2772 KB Output is correct
15 Correct 1 ms 2772 KB Output is correct
16 Correct 2 ms 2772 KB Output is correct
17 Correct 2 ms 2772 KB Output is correct
18 Correct 5 ms 3668 KB Output is correct
19 Correct 4 ms 3668 KB Output is correct
20 Correct 4 ms 3668 KB Output is correct
21 Correct 4 ms 3668 KB Output is correct
22 Correct 4 ms 3668 KB Output is correct
23 Correct 5 ms 3668 KB Output is correct
24 Correct 4 ms 3668 KB Output is correct
25 Correct 2 ms 2772 KB Output is correct
26 Correct 4 ms 3668 KB Output is correct
27 Correct 4 ms 3668 KB Output is correct
28 Correct 4 ms 3668 KB Output is correct
29 Correct 4 ms 3668 KB Output is correct
30 Correct 4 ms 3540 KB Output is correct
31 Correct 4 ms 3540 KB Output is correct
32 Correct 4 ms 3540 KB Output is correct
33 Correct 4 ms 3540 KB Output is correct
34 Runtime error 15 ms 11220 KB Execution killed with signal 11
35 Halted 0 ms 0 KB -