Submission #334081

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
334081	2020-12-08T09:43:10 Z	nicholask	Highway Tolls (IOI18_highway)	C++14	18 / 100	127 ms	8548 KB

highway

#include "highway.h"
#include <bits/stdc++.h>
#define x first
#define y second
using namespace std;
vector <pair <int,int> > g[90000]; //first: connection to which node, second: edge no.
long long dist;
vector <pair <int,int> > poss;
void dfs(int cur,int prev,int d){
	for (auto&i:g[cur]){
		if (i.x==prev) continue;
		if (d+1==dist) poss.push_back({i.y,i.x});
		else dfs(i.x,cur,d+1);
	}
}
void find_pair(int n,vector <int> u,vector <int> v,int A,int b){
	long long a=A;
	int m=u.size();
	for (int i=0; i<m; i++){
		g[u[i]].push_back({v[i],i});
		g[v[i]].push_back({u[i],i});
	}
	vector <int> query(m,0);
	dist=ask(query);
	dist/=a;
	bool can=1;
	for (int i=0; i<m; i++){
		if (u[i]!=i||v[i]!=i+1){
			can=0;
			break;
		}
	}
	if (can){ //subtask 3
		vector <int> possible;
		for (int i=0; i<n; i++) possible.push_back(i);
		while (possible.size()>1){
			vector <int> f,s;
			for (int i=0; i<possible.size(); i++){
				if (i<(possible.size()/2)) f.push_back(possible[i]);
				else s.push_back(possible[i]);
			}
			vector <int> query(m,0);
			for (auto&i:f) query[i]=1;
			if (ask(query)==dist*a) possible=s;
			else possible=f;
		}
		answer(possible[0],possible[0]+dist);
	} else {
		dfs(0,-1,0);
		while (poss.size()>1){
			vector <pair <int,int> > f,s;
			for (int i=0; i<poss.size(); i++){
				if (i<(poss.size()/2)) f.push_back(poss[i]);
				else s.push_back(poss[i]);
			}
			vector <int> query(m,0);
			for (auto&i:f) query[i.x]=1;
			if (ask(query)==dist*a) poss=s;
			else poss=f;
		}
		answer(0,poss[0].y);
	}
}

Compilation message

highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:38:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |    for (int i=0; i<possible.size(); i++){
      |                  ~^~~~~~~~~~~~~~~~
highway.cpp:39:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     if (i<(possible.size()/2)) f.push_back(possible[i]);
      |         ~^~~~~~~~~~~~~~~~~~~~
highway.cpp:52:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |    for (int i=0; i<poss.size(); i++){
      |                  ~^~~~~~~~~~~~
highway.cpp:53:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |     if (i<(poss.size()/2)) f.push_back(poss[i]);
      |         ~^~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	2412 KB	Output is correct
2	Correct	2 ms	2412 KB	Output is correct
3	Correct	2 ms	2496 KB	Output is correct
4	Correct	2 ms	2412 KB	Output is correct
5	Correct	2 ms	2432 KB	Output is correct
6	Correct	2 ms	2412 KB	Output is correct
7	Correct	2 ms	2412 KB	Output is correct
8	Correct	2 ms	2412 KB	Output is correct
9	Correct	2 ms	2496 KB	Output is correct
10	Correct	2 ms	2496 KB	Output is correct
11	Correct	2 ms	2412 KB	Output is correct
12	Correct	2 ms	2412 KB	Output is correct

Subtask #2
7.0 / 7.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	2540 KB	Output is correct
2	Correct	14 ms	3052 KB	Output is correct
3	Correct	123 ms	8300 KB	Output is correct
4	Correct	114 ms	8296 KB	Output is correct
5	Correct	127 ms	8308 KB	Output is correct
6	Correct	120 ms	8044 KB	Output is correct
7	Correct	117 ms	8072 KB	Output is correct
8	Correct	126 ms	8292 KB	Output is correct
9	Correct	117 ms	7944 KB	Output is correct
10	Correct	122 ms	8296 KB	Output is correct
11	Correct	114 ms	7692 KB	Output is correct
12	Correct	116 ms	8076 KB	Output is correct
13	Correct	118 ms	8076 KB	Output is correct
14	Correct	114 ms	8332 KB	Output is correct

Subtask #3
6.0 / 6.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	3180 KB	Output is correct
2	Correct	24 ms	3820 KB	Output is correct
3	Correct	35 ms	4332 KB	Output is correct
4	Correct	91 ms	8420 KB	Output is correct
5	Correct	106 ms	8548 KB	Output is correct
6	Correct	109 ms	8292 KB	Output is correct
7	Correct	100 ms	8300 KB	Output is correct
8	Correct	107 ms	8292 KB	Output is correct
9	Correct	108 ms	8292 KB	Output is correct