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Submission #1055853

# Submission time Handle Problem Language Result Execution time Memory
1055853 2024-08-13T06:02:24 Z d(#11110) Summer Driving (CCO24_day1problem3) C++17
9 / 25
 65 ms 34384 KB 
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...)
#endif
using pii=array<int,2>;
using tii=array<int,3>;
const int N=3005;
int n,r,a,b,dep[N],p[N],q[N],L[N],pA[N],subA[N];
vector<int> dp[N];
vector<int> dp2[N];
int dp3[N][N],dp4[N][N];
vector<int> g[N],c[N],dA[N];
void dfs0(int u){
	L[dep[u]]=u;
	if(dep[u]>=a){
		pA[u]=L[dep[u]-a];
		subA[u]=L[dep[u]-a+1];
		dA[pA[u]].push_back(u);
	}
	int idx=0;
	for(int v: g[u]) if(p[u]!=v){
		dep[v]=dep[u]+1;
		p[v]=u;
		q[v]=++idx;
		c[u].push_back(v);
		dfs0(v);
	}
}
int dfs1(int u,int d);
int dfs2(int u,int d);
int Get(int u,int k){
	int &ret=dp[u][k];
	if(ret) return ret;
	for(int i=0;i<(int)dA[u].size();i++){
		int v=dA[u][i];
		if(q[subA[v]]==k) continue;
		if(dp2[u][i]){
			ret=max(ret,dp2[u][i]);
			continue;
		}
		int val=dfs1(v,b),w=v,d=0,e=0;
		while(d<b){
			e=q[w];
			w=p[w];
			d++;
			val=min(val,Get(w,e));
			if(d<b) for(int i=0;i<(int)c[w].size();i++) if(i+1!=e) val=min(val,dfs1(c[w][i],b-d-1));
		}
		dp2[u][i]=val;
		ret=max(ret,val);
	}
	if(!ret){
		ret=u;
		for(int i=0;i<(int)c[u].size();i++) if(i+1!=k) ret=min(ret,dfs2(c[u][i],b-1));
	}
	debug(u,k,ret);
	return ret;
}
int dfs1(int u,int d){
	int &ret=dp3[u][d];
	if(ret) return ret;
	ret=Get(u,0);
	if(d>=1) for(int v: c[u]) ret=min(ret,dfs1(v,d-1));
	debug(u,d,0,ret);
	return ret;
}
int dfs2(int u,int d){
	int &ret=dp4[u][d];
	if(ret) return ret;
	ret=u;
	if(d>=1) for(int v: c[u]) ret=min(ret,dfs2(v,d-1));
	debug(u,d,1,ret);
	return ret;
}
int main(){
	ios::sync_with_stdio(false); cin.tie(0);
	cin>>n>>r>>a>>b;
	if(a<=b){
		cout<<"1\n";
		return 0;
	}
	for(int u,v,i=1;i<n;i++){
		cin>>u>>v;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	dfs0(r);
	for(int i=1;i<=n;i++){
		dp[i].resize(c[i].size()+1);
		dp2[i].resize(dA[i].size());
	}
	cout<<Get(r,0);
	return 0;
}

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 600 KB Output is correct
2 Correct 0 ms 604 KB Output is correct
3 Correct 0 ms 604 KB Output is correct
4 Correct 0 ms 604 KB Output is correct
5 Correct 0 ms 604 KB Output is correct

Subtask #2
0.0 / 4.0

# Verdict Execution time Memory Grader output
1 Runtime error 65 ms 34384 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2648 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 2732 KB Output is correct
7 Correct 1 ms 2908 KB Output is correct
8 Correct 1 ms 1884 KB Output is correct
9 Correct 0 ms 604 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 1 ms 1884 KB Output is correct
12 Correct 0 ms 860 KB Output is correct
13 Correct 1 ms 860 KB Output is correct

Subtask #4
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2648 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 2732 KB Output is correct
7 Correct 1 ms 2908 KB Output is correct
8 Correct 1 ms 1884 KB Output is correct
9 Correct 0 ms 604 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 1 ms 1884 KB Output is correct
12 Correct 0 ms 860 KB Output is correct
13 Correct 1 ms 860 KB Output is correct
14 Correct 8 ms 20316 KB Output is correct
15 Correct 8 ms 19548 KB Output is correct
16 Correct 8 ms 21720 KB Output is correct
17 Correct 8 ms 20828 KB Output is correct
18 Correct 7 ms 20176 KB Output is correct
19 Correct 8 ms 19492 KB Output is correct
20 Correct 10 ms 23652 KB Output is correct
21 Correct 5 ms 13148 KB Output is correct
22 Correct 0 ms 604 KB Output is correct
23 Correct 9 ms 18440 KB Output is correct
24 Correct 9 ms 22496 KB Output is correct
25 Correct 12 ms 23384 KB Output is correct
26 Correct 6 ms 13148 KB Output is correct
27 Correct 4 ms 12936 KB Output is correct
28 Correct 5 ms 13148 KB Output is correct
29 Correct 5 ms 13148 KB Output is correct
30 Correct 56 ms 23144 KB Output is correct
31 Correct 56 ms 23088 KB Output is correct
32 Correct 57 ms 23132 KB Output is correct
33 Correct 13 ms 14428 KB Output is correct

Subtask #5
0.0 / 4.0

# Verdict Execution time Memory Grader output
1 Runtime error 23 ms 12368 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2648 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 1 ms 2732 KB Output is correct
7 Correct 1 ms 2908 KB Output is correct
8 Correct 1 ms 1884 KB Output is correct
9 Correct 0 ms 604 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 1 ms 1884 KB Output is correct
12 Correct 0 ms 860 KB Output is correct
13 Correct 1 ms 860 KB Output is correct
14 Correct 8 ms 20316 KB Output is correct
15 Correct 8 ms 19548 KB Output is correct
16 Correct 8 ms 21720 KB Output is correct
17 Correct 8 ms 20828 KB Output is correct
18 Correct 7 ms 20176 KB Output is correct
19 Correct 8 ms 19492 KB Output is correct
20 Correct 10 ms 23652 KB Output is correct
21 Correct 5 ms 13148 KB Output is correct
22 Correct 0 ms 604 KB Output is correct
23 Correct 9 ms 18440 KB Output is correct
24 Correct 9 ms 22496 KB Output is correct
25 Correct 12 ms 23384 KB Output is correct
26 Correct 6 ms 13148 KB Output is correct
27 Correct 4 ms 12936 KB Output is correct
28 Correct 5 ms 13148 KB Output is correct
29 Correct 5 ms 13148 KB Output is correct
30 Correct 56 ms 23144 KB Output is correct
31 Correct 56 ms 23088 KB Output is correct
32 Correct 57 ms 23132 KB Output is correct
33 Correct 13 ms 14428 KB Output is correct
34 Runtime error 24 ms 12380 KB Execution killed with signal 11
35 Halted 0 ms 0 KB -

Subtask #7
0.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 600 KB Output is correct
2 Correct 0 ms 604 KB Output is correct
3 Correct 0 ms 604 KB Output is correct
4 Correct 0 ms 604 KB Output is correct
5 Correct 0 ms 604 KB Output is correct
6 Runtime error 65 ms 34384 KB Execution killed with signal 11
7 Halted 0 ms 0 KB -