Submission #158282

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
158282	2019-10-16T02:23:11 Z	kig9981	Highway Tolls (IOI18_highway)	C++17	6 / 100	168 ms	7832 KB

highway

#include "highway.h"
#include <bits/stdc++.h>
 
using namespace std;
 
vector<int> adj[90000];
int dist1[90000], dist2[90000];
bool chk[90000];
 
void find_pair(int N, vector<int> U, vector<int> V, int A, int B)
{
	int M=U.size(), S, T, s, e, E;
	vector<int> W(M,0), C1, C2;
	queue<int> Q;
	long long D=ask(W);
	for(int i=0;i<M;i++) {
		adj[U[i]].push_back(V[i]);
		adj[V[i]].push_back(U[i]);
	}
	s=0; e=N-1;
	while(s<=e) {
		int m=(s+e)>>1;
		for(int i=0;i<N;i++) W[i]=i<=m;
		if(ask(W)!=D) e=m-1;
		else s=m+1;
	}
	E=s;
	memset(dist1,0x7f,sizeof(dist1));
	memset(dist2,0x7f,sizeof(dist2));
	dist1[U[E]]=0; Q.push(U[E]);
	while(!Q.empty()) {
		int c=Q.front();
		Q.pop();
		for(auto n: adj[c]) if(dist1[n]>dist1[c]+1) {
			dist1[n]=dist1[c]+1;
			Q.push(n);
		}
	}
	dist2[V[E]]=0; Q.push(V[E]);
	while(!Q.empty()) {
		int c=Q.front();
		Q.pop();
		for(auto n: adj[c]) if(dist2[n]>dist2[c]+1) {
			dist2[n]=dist2[c]+1;
			Q.push(n);
		}
	}
	s=0; e=D/A-1;
	while(s<=e) {
		int m=(s+e)>>1;
		for(int i=0;i<M;i++) W[i]=(dist1[U[i]]<dist2[U[i]] && dist1[U[i]]<=m)^(dist1[V[i]]<dist2[V[i]] && dist1[V[i]]<=m);
		if(ask(W)!=D) e=m-1;
		else s=m+1;
	}
	for(int i=0;i<N;i++) {
		if(dist1[i]<dist2[i] && dist1[i]==s) C1.push_back(i);
		if(dist1[i]>dist2[i] && dist2[i]==D/A-1-s) C2.push_back(i);
		chk[i]=false;
	}
	s=0; e=C1.size()-1;
	while(s<=e) {
		int m=(s+e)>>1;
		for(int i=0;i<N;i++) chk[i]=false;
		for(int i=0;i<=m;i++) chk[C1[i]]=true;
		for(int i=0;i<M;i++) W[i]=chk[U[i]]^chk[V[i]];
		if(ask(W)!=D) e=m-1;
		else s=m+1;
	}
	S=C1[s];
	s=0; e=C2.size()-1;
	while(s<=e) {
		int m=(s+e)>>1;
		for(int i=0;i<N;i++) chk[i]=false;
		for(int i=0;i<=m;i++) chk[C2[i]]=true;
		for(int i=0;i<M;i++) W[i]=chk[U[i]]^chk[V[i]];
		if(ask(W)!=D) e=m-1;
		else s=m+1;
	}
	T=C2[s];
	answer(S,T);
}

Subtask #1
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	9 ms	6288 KB	Execution killed with signal 11 (could be triggered by violating memory limits)
2	Halted	0 ms	0 KB	-

Subtask #2
0 / 7.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	3192 KB	Output is correct
2	Runtime error	28 ms	7160 KB	Execution killed with signal 11 (could be triggered by violating memory limits)
3	Halted	0 ms	0 KB	-

Subtask #3
6.0 / 6.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	22 ms	3576 KB	Output is correct
2	Correct	42 ms	4156 KB	Output is correct
3	Correct	54 ms	4664 KB	Output is correct
4	Correct	152 ms	7832 KB	Output is correct
5	Correct	168 ms	7800 KB	Output is correct
6	Correct	161 ms	7808 KB	Output is correct
7	Correct	163 ms	7760 KB	Output is correct
8	Correct	166 ms	7812 KB	Output is correct
9	Correct	154 ms	7720 KB	Output is correct