Submission #102732

#	Time	Username	Problem	Language	Result	Execution time	Memory
102732		bert30702	Highway Tolls (IOI18_highway)	C++17	100 / 100	408 ms	63832 KiB

highway

#include <bits/stdc++.h>
#include "highway.h"
#define pii pair<int, int>
#define F first
#define S second
#define int long long
using namespace std;
const int MX = 1e6 + 100;
vector<pii> G1[MX], G2[MX];
bitset<MX> pass, edge;
int deep[MX];
vector<pii> que;
void dfs(int u, int l, int d) {
	que.push_back({u, l});
	deep[u] = d;
	for(auto it: G2[u]) dfs(it.F, it.S, d + 1);
}
void find_pair(int32_t n, vector<int32_t> u, vector<int32_t> v, int32_t a, int32_t b) {
	for(int i = 0; i < u.size(); i ++) {
		G1[u[i]].push_back({v[i], i});
		G1[v[i]].push_back({u[i], i});
	}
	int d = ask(vector<int32_t>(u.size(), 0));
	int l = 0, r = u.size() - 1;
	while(l != r) {
		int m = l + r >> 1;
		vector<int32_t> query(u.size(), 0);
		for(int i = 0; i <= m; i ++) query[i] = 1;
		if(ask(query) > d) r = m;
		else               l = m + 1;
	}
	pass[u[l]] = pass[v[l]] = edge[l] = true;
	queue<int> q;
	q.push(u[l]); q.push(v[l]);
	while(q.size()) {
		int p = q.front(); q.pop();
		for(auto i: G1[p]) {
			if(!pass[i.F]) {
				edge[i.S] = pass[i.F] = true;
				G2[p].push_back(i);
				q.push(i.F);
			}
		}
	}
	vector<int> Yeeee = {u[l], v[l]}, YEEEE;
	for(auto it: Yeeee) {
		que.clear();
		dfs(it, l, 1);
		sort(que.begin(), que.end(), [](pii a, pii b) {
			return deep[a.F] < deep[b.F];	
		});
		int l = 0, r = que.size() - 1;
		while(l != r) {
			int m = l + r >> 1;
			vector<int32_t> query(u.size(), 1);
			for(int i = 0; i < u.size(); i ++) {
				if(edge[i]) query[i] = 0;
			}
			for(int i = m + 1; i <= r; i ++) {
				query[que[i].S] = 1;
			}
			if(ask(query) > d) l = m + 1;
			else               r = m;
		}
		YEEEE.push_back(que[l].F);
	}
	answer(YEEEE[0], YEEEE[1]);
}

Compilation message (stderr)

highway.cpp: In function 'void find_pair(int32_t, std::vector<int>, std::vector<int>, int32_t, int32_t)':
highway.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < u.size(); i ++) {
                 ~~^~~~~~~~~~
highway.cpp:26:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m = l + r >> 1;
           ~~^~~
highway.cpp:54:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    int m = l + r >> 1;
            ~~^~~
highway.cpp:56:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i = 0; i < u.size(); i ++) {
                   ~~^~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 6 / 6
• Subtask 4: 33 / 33
• Subtask 5: 18 / 18
• Subtask 6: 31 / 31