Submission #1197066

#	Time	Username	Problem	Language	Result	Execution time	Memory
1197066		tkm_algorithms	Highway Tolls (IOI18_highway)	C++20	0 / 100	6 ms	1256 KiB

highway

/**
*    In the name of Allah
*    We are nothing and you're everything
**/
#include <bits/stdc++.h>
#include "highway.h"
using namespace std;
using ll = long long;

#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()

const char nl = '\n';

vector<int> w;
const int NN = 9e4+5;

int btree[NN], whom[NN];

//int ask(vector<int> w1) {
	//int cost = 0;
	//for (int i = 0; i < sz(w1); ++i) {
		//if (w1[i] == 1) {
			//if (i == 0)cost += 2;
		//} else 
			//if (i == 0)cost += 1;
	//}
	//return cost;
//}

//void answer(int x, int y) {
	//cout << y;
//}

void find_pair(int N, vector<int> u, vector<int> v, int a, int b) {
	int m = sz(u), n = N;
	vector<pair<int, int>> g[n+1];
	w.resize(m);
	for (int i = 0; i < m; ++i) {
		g[u[i]].push_back({v[i], i});
		g[v[i]].push_back({u[i], i});
	}
	
	ll cost = ask(w), len = cost/a;
	
	//int l = 0, r = n+1;
	//while (r-l>1) {
		//int mid = l+r>>1;
		//for (int i = 0; i < m; ++i) {
			//w[i] = 0;
			//if (i < mid)w[i] = 1;
		//}
		//ll d = ask(w);
		//if (d != cost)r = mid;
		//else l = mid;
	//}
	
	int r = 0;
	for (int i = 0; i < n-1; ++i) {
		w[i] = 1;
		ask(w);
		ll d = ask(w);
		if (d != cost){r = i; break;}
		w[i] = 0;
	}
	//r--;
	int start = u[r], end = u[r];
	while (len > 0) {
		end = g[end][0].first;
		len -= 1;
	}
	
	answer(start, end);
}


//void solve() {
	//int n, m; cin >> n >> m;
	//vector<int> u(m), v(m);
	//for (int i = 0; i < m; ++i) {
		//cin >> u[i] >> v[i];
	//}
	
	//find_pair(n, u, v, 1, 2);
//}

//int32_t main() {
    //ios::sync_with_stdio(0);
    //cin.tie(0);
    //int t = 1;
    //for (int _ = 0; _ < t; ++_) {
        //solve();
    //}
    //return 0;
//}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 6
• Subtask 4: 0 / 33
• Subtask 5: 0 / 18
• Subtask 6: 0 / 31