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Submission #294569

# Submission time Handle Problem Language Result Execution time Memory
294569 2020-09-09T05:20:18 Z b00n0rp Highway Tolls (IOI18_highway) C++17
100 / 100
 304 ms 13852 KB 
#include "highway.h"
#include<bits/stdc++.h>
using namespace std;

#define vi vector<int>
#define pb push_back
#define REP(i,n) for(int i = 0; i < n; i ++)
#define FOR(i,a,b) for(int i = a; i < b; i ++)
#define pii pair<int,int>
#define F first
#define S second

const int MAXN = 200005;

int n,m,S,T;
long long path;

vector<pii> adj[MAXN];

int vis[MAXN];

void find_pair(int N, vi U, vi V, int A, int B) {
	n = N;
	m = U.size();

	REP(i,m){
		adj[U[i]].pb({V[i],i});
		adj[V[i]].pb({U[i],i});
	}

	vi w(m,0);
	path = ask(w);

	int l = 0,r = m-1,mid;
	while(l < r){
		mid = (l+r)/2;
		FOR(i,l,mid+1) w[i] = 1;
		if(ask(w) == path) l = mid+1;
		else{
			FOR(i,l,mid+1) w[i] = 0;
			r = mid;
		}
	}

	vector<pii> v1,v2;

	queue<pii> q;
	q.push({U[l],-1});
	vis[U[l]] = 1;
	q.push({V[l],-1});
	vis[V[l]] = 2;

	while(!q.empty()){
		pii u = q.front();
		q.pop();

		// cout << u.F << " " << u.S << " " << vis[u.F] << endl;
		
		if(vis[u.F] == 1) v1.pb(u);
		else v2.pb(u);

		for(auto v:adj[u.F]){
			if(!vis[v.F]){
				vis[v.F] = vis[u.F];
				q.push(v);
			}
		}
	}

	int low = 0,high = v1.size()-1;
	while(low < high){
		mid = (low+high)/2;
		REP(i,m) w[i] = 1;
		w[l] = 0;
		FOR(i,1,(int)v2.size()) w[v2[i].S] = 0;
		FOR(i,1,mid+1) w[v1[i].S] = 0;
		if(ask(w) == path) high = mid;
		else low = mid+1;
	}
	S = v1[low].F;
	// cout << "S::: " << S << "\n";

	low = 0,high = v2.size()-1;
	while(low < high){
		mid = (low+high)/2;
		REP(i,m) w[i] = 1;
		w[l] = 0;
		FOR(i,1,(int)v1.size()) w[v1[i].S] = 0;
		FOR(i,1,mid+1) w[v2[i].S] = 0;
		if(ask(w) == path) high = mid;
		else low = mid+1;
	}
	T = v2[low].F;
	// cout << "T::: " << T << "\n";

	answer(S,T);
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 4992 KB Output is correct
2 Correct 4 ms 5132 KB Output is correct
3 Correct 4 ms 5076 KB Output is correct
4 Correct 4 ms 4992 KB Output is correct
5 Correct 4 ms 4992 KB Output is correct
6 Correct 4 ms 4992 KB Output is correct
7 Correct 4 ms 4992 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 4 ms 4992 KB Output is correct
10 Correct 4 ms 4992 KB Output is correct
11 Correct 4 ms 4992 KB Output is correct
12 Correct 4 ms 5024 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 5120 KB Output is correct
2 Correct 15 ms 5888 KB Output is correct
3 Correct 145 ms 11680 KB Output is correct
4 Correct 150 ms 11772 KB Output is correct
5 Correct 147 ms 11692 KB Output is correct
6 Correct 145 ms 11684 KB Output is correct
7 Correct 148 ms 11812 KB Output is correct
8 Correct 150 ms 11816 KB Output is correct
9 Correct 145 ms 11688 KB Output is correct
10 Correct 145 ms 11684 KB Output is correct
11 Correct 160 ms 10980 KB Output is correct
12 Correct 157 ms 11212 KB Output is correct
13 Correct 156 ms 11120 KB Output is correct
14 Correct 183 ms 11368 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 5752 KB Output is correct
2 Correct 28 ms 6392 KB Output is correct
3 Correct 43 ms 7104 KB Output is correct
4 Correct 124 ms 10948 KB Output is correct
5 Correct 127 ms 11052 KB Output is correct
6 Correct 132 ms 11312 KB Output is correct
7 Correct 122 ms 11072 KB Output is correct
8 Correct 125 ms 10940 KB Output is correct
9 Correct 122 ms 11524 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 5120 KB Output is correct
2 Correct 17 ms 5760 KB Output is correct
3 Correct 102 ms 10532 KB Output is correct
4 Correct 144 ms 11676 KB Output is correct
5 Correct 141 ms 11768 KB Output is correct
6 Correct 138 ms 11724 KB Output is correct
7 Correct 139 ms 11692 KB Output is correct
8 Correct 134 ms 11648 KB Output is correct
9 Correct 150 ms 11872 KB Output is correct
10 Correct 150 ms 11804 KB Output is correct
11 Correct 153 ms 11104 KB Output is correct
12 Correct 154 ms 11280 KB Output is correct
13 Correct 160 ms 11200 KB Output is correct
14 Correct 158 ms 11012 KB Output is correct
15 Correct 140 ms 11820 KB Output is correct
16 Correct 136 ms 11704 KB Output is correct
17 Correct 159 ms 11364 KB Output is correct
18 Correct 156 ms 11144 KB Output is correct
19 Correct 139 ms 11772 KB Output is correct
20 Correct 152 ms 11108 KB Output is correct
21 Correct 120 ms 12928 KB Output is correct
22 Correct 121 ms 12904 KB Output is correct
23 Correct 135 ms 12124 KB Output is correct
24 Correct 145 ms 12264 KB Output is correct
25 Correct 154 ms 11272 KB Output is correct

Subtask #5
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 5752 KB Output is correct
2 Correct 18 ms 5888 KB Output is correct
3 Correct 177 ms 12124 KB Output is correct
4 Correct 199 ms 12884 KB Output is correct
5 Correct 214 ms 13788 KB Output is correct
6 Correct 231 ms 13568 KB Output is correct
7 Correct 220 ms 13444 KB Output is correct
8 Correct 232 ms 13448 KB Output is correct
9 Correct 166 ms 11388 KB Output is correct
10 Correct 170 ms 11704 KB Output is correct
11 Correct 182 ms 12204 KB Output is correct
12 Correct 227 ms 13104 KB Output is correct
13 Correct 230 ms 13276 KB Output is correct
14 Correct 238 ms 13448 KB Output is correct
15 Correct 217 ms 13656 KB Output is correct
16 Correct 188 ms 12264 KB Output is correct
17 Correct 143 ms 12644 KB Output is correct
18 Correct 140 ms 12876 KB Output is correct
19 Correct 138 ms 12764 KB Output is correct
20 Correct 138 ms 12712 KB Output is correct
21 Correct 211 ms 13656 KB Output is correct

Subtask #6
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 5760 KB Output is correct
2 Correct 25 ms 5880 KB Output is correct
3 Correct 230 ms 11944 KB Output is correct
4 Correct 182 ms 12272 KB Output is correct
5 Correct 196 ms 12588 KB Output is correct
6 Correct 304 ms 13428 KB Output is correct
7 Correct 214 ms 12100 KB Output is correct
8 Correct 220 ms 12380 KB Output is correct
9 Correct 240 ms 12412 KB Output is correct
10 Correct 299 ms 13308 KB Output is correct
11 Correct 293 ms 13588 KB Output is correct
12 Correct 295 ms 13404 KB Output is correct
13 Correct 233 ms 12260 KB Output is correct
14 Correct 169 ms 11704 KB Output is correct
15 Correct 239 ms 12276 KB Output is correct
16 Correct 164 ms 11692 KB Output is correct
17 Correct 174 ms 12220 KB Output is correct
18 Correct 173 ms 11840 KB Output is correct
19 Correct 210 ms 12960 KB Output is correct
20 Correct 289 ms 13564 KB Output is correct
21 Correct 298 ms 13384 KB Output is correct
22 Correct 224 ms 13396 KB Output is correct
23 Correct 229 ms 13392 KB Output is correct
24 Correct 239 ms 13344 KB Output is correct
25 Correct 225 ms 13852 KB Output is correct
26 Correct 222 ms 13780 KB Output is correct
27 Correct 143 ms 12716 KB Output is correct
28 Correct 136 ms 12652 KB Output is correct
29 Correct 131 ms 12896 KB Output is correct
30 Correct 132 ms 12516 KB Output is correct
31 Correct 149 ms 12836 KB Output is correct
32 Correct 177 ms 12708 KB Output is correct
33 Correct 165 ms 12964 KB Output is correct
34 Correct 144 ms 12712 KB Output is correct
35 Correct 138 ms 12720 KB Output is correct
36 Correct 135 ms 12588 KB Output is correct
37 Correct 139 ms 12964 KB Output is correct
38 Correct 138 ms 12580 KB Output is correct
39 Correct 297 ms 13572 KB Output is correct
40 Correct 292 ms 13548 KB Output is correct
41 Correct 290 ms 13652 KB Output is correct
42 Correct 232 ms 13224 KB Output is correct