oj.uz

Submission #933807

# Submission time Handle Problem Language Result Execution time Memory
933807 2024-02-26T10:57:07 Z kim Highway Tolls (IOI18_highway) C++17
5 / 100
 159 ms 12912 KB 
#include "highway.h"
#include<bits/stdc++.h>
using namespace std;
#define eb emplace_back
using pii=pair<int,int>;
#define f first
#define s second

using ti3=tuple<int,int,int>;

vector<int> adj1[90005],adj2[90005];
bitset<90005> vis;
int pre[90005];

vector<int> ans,tmp;
int dist;
int play(int n,vector<int> &U,vector<int> &V,int u0){
	for(int i=0;i<n;++i) adj2[i].clear();
	vis=0;
	int m=U.size();
	{
		queue<int> q;
		q.emplace(u0);
		vis[u0]=1;
		while(q.size()){
			int u=q.front(); q.pop();
			for(auto &v:adj1[u]){
				if(vis[v]) continue;
				vis[v]=1;
				q.emplace(v);
				adj2[u].eb(v);
			}
		}
	}
	{
		stack<pii> st;
		st.emplace(u0,u0);
		int id=-1;
		while(st.size()){
			auto [u,p]=st.top(); st.pop();
			pre[u]=++id;
			for(auto &v:adj2[u]){
				if(v!=p) st.emplace(v,u);
			}
		}
	}
	int l=0,r=n-1;
	while(l<r){
		int mid=l+r>>1;
		for(int i=0;i<m;++i){
			if(pre[U[i]]<=mid&&pre[V[i]]<=mid) tmp[i]=0;
			else tmp[i]=1;
		}
		if(ask(tmp)==dist) r=mid;
		else l=mid+1;
	}
	cerr<<pre[0]<<" "<<pre[1]<<" "<<pre[2]<<" "<<pre[3]<<'\n';
	for(int i=0;i<n;++i){
		if(pre[i]==l){
			ans.eb(i);
			return i;
		}
	}
}

void find_pair(int N, std::vector<int> U, std::vector<int> V, int A, int B) {
	for(int i=0;i<U.size();++i){
		adj1[U[i]].eb(V[i]);
		adj1[V[i]].eb(U[i]);
	}
	tmp.assign((int)U.size(),0);
	dist=ask(tmp);
	play(N,U,V,play(N,U,V,0));
	answer(ans[0],ans[1]);
}

Compilation message

highway.cpp: In function 'int play(int, std::vector<int>&, std::vector<int>&, int)':
highway.cpp:49:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   49 |   int mid=l+r>>1;
      |           ~^~
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:67:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |  for(int i=0;i<U.size();++i){
      |              ~^~~~~~~~~
highway.cpp: In function 'int play(int, std::vector<int>&, std::vector<int>&, int)':
highway.cpp:64:1: warning: control reaches end of non-void function [-Wreturn-type]
   64 | }
      | ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4864 KB Output is correct
2 Correct 1 ms 4864 KB Output is correct
3 Correct 1 ms 4868 KB Output is correct
4 Correct 1 ms 4868 KB Output is correct
5 Correct 2 ms 4872 KB Output is correct
6 Correct 1 ms 4864 KB Output is correct
7 Correct 2 ms 5124 KB Output is correct
8 Correct 1 ms 4864 KB Output is correct
9 Correct 2 ms 4868 KB Output is correct
10 Correct 2 ms 4868 KB Output is correct
11 Correct 1 ms 4864 KB Output is correct
12 Correct 1 ms 4872 KB Output is correct

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4916 KB Output is correct
2 Correct 12 ms 5596 KB Output is correct
3 Correct 103 ms 11888 KB Output is correct
4 Correct 127 ms 12188 KB Output is correct
5 Correct 99 ms 11460 KB Output is correct
6 Correct 145 ms 11460 KB Output is correct
7 Correct 102 ms 11452 KB Output is correct
8 Correct 92 ms 11248 KB Output is correct
9 Correct 140 ms 12128 KB Output is correct
10 Correct 93 ms 11444 KB Output is correct
11 Correct 93 ms 12912 KB Output is correct
12 Correct 111 ms 12888 KB Output is correct
13 Correct 102 ms 12676 KB Output is correct
14 Incorrect 126 ms 12676 KB Output is incorrect: {s, t} is wrong.
15 Halted 0 ms 0 KB -

Subtask #3
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 5732 KB Output is correct
2 Correct 19 ms 6588 KB Output is correct
3 Correct 27 ms 7444 KB Output is correct
4 Correct 68 ms 12456 KB Output is correct
5 Correct 95 ms 12668 KB Output is correct
6 Correct 74 ms 12664 KB Output is correct
7 Correct 70 ms 12672 KB Output is correct
8 Correct 126 ms 12680 KB Output is correct
9 Incorrect 74 ms 12432 KB Output is incorrect: {s, t} is wrong.
10 Halted 0 ms 0 KB -

Subtask #4
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4912 KB Output is correct
2 Correct 10 ms 5596 KB Output is correct
3 Correct 80 ms 10320 KB Output is correct
4 Correct 118 ms 11656 KB Output is correct
5 Correct 159 ms 11212 KB Output is correct
6 Correct 114 ms 11924 KB Output is correct
7 Correct 100 ms 11904 KB Output is correct
8 Correct 98 ms 11652 KB Output is correct
9 Incorrect 91 ms 11328 KB Output is incorrect: {s, t} is wrong.
10 Halted 0 ms 0 KB -

Subtask #5
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 13 ms 5640 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Incorrect 15 ms 5640 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -