Submission #744672

#	Time	Username	Problem	Language	Result	Execution time	Memory
744672		oolimry	Archery (IOI09_archery)	C++17	42 / 100	2091 ms	31664 KiB

archery

#include <bits/stdc++.h>
using namespace std;
#define sz(x) (int) (x).size()
#define all(x) (x).begin(), (x).end()
#define show(x) cerr << #x << " is " << x << endl;
#define show2(x,y) cerr << #x << " is " << x << " " << #y << " is " << y << endl;
#define show3(x,y,z) cerr << #x << " is " << x << " " << #y << " is " << y << " " << #z << " is " << z << endl;
typedef long long lint;
typedef pair<lint,lint> ii;

int arr[400005];
int target[400005];
int n, R; 
int me;

int bruhmod(int x){
	int res = x%n;
	if(res <= 0) res += n;
	return res;
}

///for strong
vector<int> candidates[600005];

int solve(int s){
	target[me] = s;
	for(int i = 1;i <= 2*n;i++){
		int newi = i + (i >= 2*s);
		target[arr[i]] = (newi+1)/2;
	}
	
	//for(int i = 1;i <= 2*n;i++) show2(i, target[i]);
	
	if(me >= n+2){ ///weak
		set<int> available;
		for(int i = 2;i <= n;i++) available.insert(i);
		
		for(int i = 2*n;i >= me;i--){
			auto it = available.upper_bound(target[i]);
			
			bool looparound = false;
			
			if(it == available.begin()){
				it = --available.end();
				looparound = true;
			}
			else it--;
						
			if(i == me) return *it - (looparound * n);
			available.erase(it);
		}
	}
	else{ ///strong
		for(int i = 1;i <= 3*n;i++) candidates[i].clear();
		
		for(int i = 1;i <= 2*n;i++){
			candidates[target[i]].push_back(i);
		}
		
		if(candidates[1][0] < candidates[1][1]) swap(candidates[1][0], candidates[1][1]);
		int winner = candidates[1][1]; candidates[1].pop_back();
		
		int looparounds = 0;
		
		priority_queue<int, vector<int>, greater<int> > choices;
		for(int turn = 1;turn <= 3*n+1;turn++){
			for(int x : candidates[turn]) choices.push(x);
			
			int t = choices.top(); choices.pop();
			
			if(turn > n and t == me){
				int turnsleft = R-turn+1;
				
				looparounds += (turnsleft + n - 1) / n;
				
				turnsleft %= n;
								
				int res = (1-turnsleft+n) % n;
				if(res == 0) res = n;
				return res -  n * looparounds;
			}
			
			if(t < winner) swap(t, winner);
			if(t == me) looparounds++;
			
			candidates[turn+n].push_back(t);
		}
	}
}

int bsta(int x){ ///find last position <= x
	int low = 0, high = n+1;
		
	while(low < high-1){
		int mid = (low+high)/2;
		
		if(solve(mid) <= x) low = mid;
		else high = mid;
	}
	
	return low;
}

int bestPos = -1;
int bestVal = 1;
void consider(int pos){
	int val = solve(pos);
	int valmod = bruhmod(val); 
	
	//show3(valmod, bestVal, pos);	
	
	if(valmod <= bestVal){
		bestVal = valmod;
		bestPos = pos;
	}
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0);
	
	cin >> n >> R;
	cin >> me;
	
	if(me == 1){
		cout << n;
		return 0;
	}
	
	for(int i = 1;i <= 2*n-1;i++) cin >> arr[i];
	
	for(int t = 1;t <= n-1;t++) assert(solve(t) <= solve(t+1));
	
	
	bestVal = n+1;
	int small = solve(1);
	consider(1); consider(n);
	
	small += (n - bruhmod(small));
	
	for(int x = 0;x < 3;x++){
		int pos = bsta(small);
		if(pos >= n) break;
		
		pos++;
		int val = solve(pos);
		pos = bsta(val);
		consider(pos);
		
		small += n;
	}
	
	cout << bestPos;
}

Compilation message (stderr)

archery.cpp: In function 'int solve(int)':
archery.cpp:89:1: warning: control reaches end of non-void function [-Wreturn-type]
   89 | }
      | ^

• Subtask 1: 6 / 6
• Subtask 2: 36 / 94