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답안 #744665

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
744665 2023-05-18T23:17:57 Z oolimry Archery (IOI09_archery) C++17
84 / 100
 2000 ms 33100 KB 
#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];
	
	
	
	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

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

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 14420 KB Output is correct
2 Correct 9 ms 14292 KB Output is correct
3 Correct 9 ms 14420 KB Output is correct
4 Correct 24 ms 14676 KB Output is correct
5 Correct 8 ms 14420 KB Output is correct
6 Correct 10 ms 14420 KB Output is correct

Subtask #2
78.0 / 94.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 14420 KB Output is correct
2 Correct 10 ms 14420 KB Output is correct
3 Correct 18 ms 14676 KB Output is correct
4 Correct 141 ms 16204 KB Output is correct
5 Execution timed out 2085 ms 30652 KB Time limit exceeded
6 Correct 10 ms 14420 KB Output is correct
7 Incorrect 10 ms 14420 KB Output isn't correct
8 Incorrect 63 ms 16168 KB Output isn't correct
9 Correct 204 ms 16724 KB Output is correct
10 Incorrect 11 ms 14548 KB Output isn't correct
11 Correct 214 ms 16940 KB Output is correct
12 Correct 29 ms 14768 KB Output is correct
13 Correct 1966 ms 29044 KB Output is correct
14 Correct 48 ms 14932 KB Output is correct
15 Correct 363 ms 18184 KB Output is correct
16 Correct 9 ms 14420 KB Output is correct
17 Correct 15 ms 14548 KB Output is correct
18 Correct 18 ms 14548 KB Output is correct
19 Correct 28 ms 14800 KB Output is correct
20 Correct 40 ms 14984 KB Output is correct
21 Correct 222 ms 16944 KB Output is correct
22 Correct 259 ms 17376 KB Output is correct
23 Execution timed out 2082 ms 33100 KB Time limit exceeded
24 Correct 9 ms 14420 KB Output is correct
25 Correct 16 ms 14420 KB Output is correct
26 Correct 47 ms 14732 KB Output is correct
27 Correct 214 ms 15700 KB Output is correct
28 Execution timed out 2062 ms 22300 KB Time limit exceeded
29 Correct 14 ms 14420 KB Output is correct
30 Correct 50 ms 14680 KB Output is correct
31 Correct 218 ms 15700 KB Output is correct
32 Execution timed out 2057 ms 25356 KB Time limit exceeded
33 Correct 10 ms 14420 KB Output is correct
34 Correct 9 ms 14420 KB Output is correct
35 Correct 19 ms 14556 KB Output is correct
36 Correct 22 ms 14548 KB Output is correct
37 Correct 191 ms 15472 KB Output is correct
38 Correct 298 ms 15964 KB Output is correct
39 Correct 8 ms 14420 KB Output is correct
40 Correct 12 ms 14376 KB Output is correct
41 Correct 20 ms 14548 KB Output is correct
42 Correct 21 ms 14576 KB Output is correct
43 Correct 44 ms 14676 KB Output is correct
44 Correct 91 ms 15032 KB Output is correct
45 Correct 192 ms 15660 KB Output is correct
46 Correct 285 ms 15780 KB Output is correct
47 Execution timed out 2081 ms 26836 KB Time limit exceeded