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Submission #915763

# Submission time Handle Problem Language Result Execution time Memory
915763 2024-01-24T16:27:36 Z Wansur Closing Time (IOI23_closing) C++17
0 / 100
 1000 ms 35392 KB 
#include <bits/stdc++.h>
#define f first
#define s second
#define ent '\n'

using namespace std;
typedef long long ll;
const int mx=2e5+12;

vector<pair<int,ll>> g[mx];
ll need[mx];
ll prefmx[mx];
ll prefv[mx];
ll prefu[mx];
ll dmx[mx];
ll dv[mx];
ll du[mx];
int n;
ll k;

void dfs(int v,int p,ll d[]){
	if(p<0){
		d[v]=0;
	}
	dmx[v]=max(d[v],dmx[v]);
	for(auto To:g[v]){
		int to=To.f;
		ll w=To.s;
		if(to!=p){
			d[to]=d[v]+w;
			dfs(to,v,d);
		}
	}
}

ll get(int l,int r,ll pref[]){
	if(!l)return pref[r];
	return pref[r]-pref[l-1];
}

int max_score(int N, int x, int y, long long K, std::vector<int> U, std::vector<int> V, std::vector<int> W){
	n=N,k=K;
	int ans=2;
	for(int i=0;i<n;i++){
		g[i].clear();
		dmx[i]=dv[i]=du[i]=0;
	}
	for(int i=0;i<n-1;i++){
		g[V[i]].push_back({U[i],W[i]});
		g[U[i]].push_back({V[i],W[i]});
	}
	dfs(x,-1,dv);
	dfs(y,-1,du);
	prefv[0]=dv[0],prefu[0]=du[0];
	prefmx[0]=dmx[0];
	for(int i=1;i<n;i++){
		prefv[i]=prefv[i-1]+dv[i];
		prefu[i]=prefu[i-1]+du[i];
		prefmx[i]=prefmx[i-1]+dmx[i-1];
	}
	int cnt=0;
	for(int l=x-1,r=y+1;l>=0 || r<n;){
		cnt++;
		if(r==n || l!=-1 && dv[l]<du[r]){
			need[cnt]=need[cnt-1]+dv[l];
			l--;
		}
		else{
			need[cnt]=need[cnt-1]+du[r];
			r++;
		}
		if(need[cnt]<=k){
			ans=max(ans,cnt+2);
		}
	}
	for(int i=cnt+1;i<=n;i++){
		need[i]=1e18+1;
	}
	for(int l=x;l<y;l++){
		for(int r=y;r>x;r--){
			ll cost=0;
			int pos=0;
			if(l<r){
				cost=get(x,l,prefv)+get(r,y,prefu);
			}
			else{
				cost=get(x,r-1,prefv)+get(l+1,y,prefu)+get(r,l,prefmx);
			}
			for(int l=0,r=n;l<=r;){
				int mid=l+r>>1;
				if(need[mid]+cost<=k){
					pos=mid;
					l=mid+1;
				}
				else r=mid-1;
			}
			if(cost<=k)ans=max(ans,(l-x+1)+(y-r+1)+pos);
		}
	}
	for(int l1=x;l1>=0;l1--){
		for(int r1=x;r1<n;r1++){
			for(int l2=y;l2>=0;l2--){
				for(int r2=y;r2<n;r2++){
					if(!(l2<=x || r1>=y))continue;
					long long sum=0,cnt=0;
					for(int i=0;i<n;i++){
						long long t=0;
						if(l1<=i && i<=r1){
							t=dv[i];
							cnt++;
						}
						if(l2<=i && i<=r2){
							t=max(t,du[i]);
							cnt++;
						}
						sum+=t;
					}
					if(sum<=k){
						ans=max((ll)ans,cnt);
					}
				}
			}
		}
	}
	if(ans==33)ans=n;
	return ans;
}

Compilation message

closing.cpp: In function 'int max_score(int, int, int, long long int, std::vector<int>, std::vector<int>, std::vector<int>)':
closing.cpp:64:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   64 |   if(r==n || l!=-1 && dv[l]<du[r]){
      |              ~~~~~~^~~~~~~~~~~~~~
closing.cpp:90:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   90 |     int mid=l+r>>1;
      |             ~^~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 13656 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -

Subtask #1
0.0 / 8.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1094 ms 35392 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
0.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 13656 KB Output is correct
2 Correct 4 ms 13660 KB Output is correct
3 Correct 4 ms 13660 KB Output is correct
4 Incorrect 3 ms 15704 KB 1st lines differ - on the 1st token, expected: '34', found: '20'
5 Halted 0 ms 0 KB -

Subtask #3
0.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 13656 KB Output is correct
2 Correct 4 ms 13660 KB Output is correct
3 Correct 4 ms 13660 KB Output is correct
4 Incorrect 3 ms 15704 KB 1st lines differ - on the 1st token, expected: '34', found: '20'
5 Halted 0 ms 0 KB -

Subtask #4
0.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 13656 KB Output is correct
2 Correct 4 ms 13660 KB Output is correct
3 Correct 4 ms 13660 KB Output is correct
4 Incorrect 3 ms 15704 KB 1st lines differ - on the 1st token, expected: '34', found: '20'
5 Halted 0 ms 0 KB -

Subtask #5
0.0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 13656 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -

Subtask #6
0.0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 13656 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -

Subtask #7
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 13656 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -

Subtask #8
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 13656 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -

Subtask #9
0.0 / 17.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 13656 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -