Submission #1023425

#	Time	Username	Problem	Language	Result	Execution time	Memory
1023425		Issa	Prisoner Challenge (IOI22_prison)	C++17	100 / 100	8 ms	1116 KiB

prison

#include <bits/stdc++.h>
using namespace std;

vector<pair<int, int>> g[10];

int a[10];
int f[10];

int get(int j, int x, int i = 8){
	if(i == j) return x;
	for(auto [l, r]: g[i]){
		if(x >= l && x <= r){
			return get(j, x - l + 1, i - 1);
		}
	}
	return -1;
}

std::vector<std::vector<int>> devise_strategy(int N){
	vector<vector<int>> s(21, vector<int>(N + 1, 0));
	a[8] = 5588;
	for(int i = 8; i > 3; i--){
		int k = (a[i] - 2) / 3;
		g[i].push_back({2, k + 1});
		g[i].push_back({k + 2, k * 2 + 1});
		g[i].push_back({k * 2 + 2, a[i] - 1});
		a[i-1] = k;
	}
	for(int i = 3; i > 1; i--){
		int k = (a[i] - 2) / 2;
		g[i].push_back({2, k + 1});
		g[i].push_back({k + 2, a[i] - 1});
		a[i-1] = k;
	}
	g[1] = {{2, 3}};
	for(int i = 2; i <= 8; i++){
		f[i] = f[i-1] + g[i-1].size();

	}
	for(int i = 1; i <= 8; i++){
		for(int c = 0; c < g[i].size(); c++){
			int x = f[i] + c + 1;
			s[x][0] = i & 1;
			for(int j = 1; j <= N; j++){
				int w = get(i, j);
				if(w < 0) continue;
				if(w == 1) s[x][j] = - s[x][0] - 1;
				else if(w == a[i]) s[x][j] = - (s[x][0] ^ 1) - 1;
				else{
					int c1 = 0;
					while(g[i][c1].second < w) c1++;
					if(c1 < c) s[x][j] = - s[x][0] - 1;
					else if(c1 > c) s[x][j] = - (s[x][0] ^ 1) - 1;
					else if(g[i][c1].first == w) s[x][j] = - s[x][0] - 1;
					else if(g[i][c1].second == w) s[x][j] = - (s[x][0] ^ 1) - 1;
					else{
						w = get(i - 1, j); c1 = 0;
						while(g[i-1][c1].second < w) c1++;
						s[x][j] = f[i-1] + c1 + 1;
					}
				}
			}		
		}
	}
	s[0][0] = 1;
	for(int i = 1; i <= N; i++){
		if(i == 1) s[0][i] = -2;
		else{
			int c = 0;
			while(g[8][c].second < i) c++;
			s[0][i] = f[8] + c + 1;
		}
	}	
	return s;
}

Compilation message (stderr)

prison.cpp: In function 'std::vector<std::vector<int> > devise_strategy(int)':
prison.cpp:41:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |   for(int c = 0; c < g[i].size(); c++){
      |                  ~~^~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 90 / 90