Submission #155441

#	Time	Username	Problem	Language	Result	Execution time	Memory
155441		oolimry	Cop and Robber (BOI14_coprobber)	C++14	100 / 100	1254 ms	8008 KiB

coprobber

#include "coprobber.h"
#include <bits/stdc++.h>
using namespace std;
static bool states[500005]; //police * 1000 + robber * 2 + (IF POLICE TURN)
static int degree[500005];
static int to[500005];
//static vector<int> rev[500005];
static queue<int> can;
inline int g(int police, int robber, int turn){
	return police * 1000 + robber * 2 + turn;
}
int pos;
int start(int N, bool A[MAX_N][MAX_N])
{
	int n = N;
    for(int u = 0;u < n;u++){
		for(int v = 0;v < n;v++){
			int s = g(u,v,0);
			
			//rev[s+1].push_back(s); //Wait
			degree[s]++;
			for(int i = 0;i < n;i++){
				if(A[u][i] == 1){
					//rev[g(i,v,1)].push_back(s);
					degree[s]++;
				}
				if(A[v][i] == 1){
					//rev[g(u,i,0)].push_back(s+1);
					degree[s+1]++;
				}
			}
			
			
			if(u == v){
				states[s] = 1;
				states[s+1] = 1;
			}
		}
	}
	
	for(int i = 0;i < 500005;i++){
		if(states[i] == 1){
			can.push(i);
			degree[i] = 0;
		}
	}
	int work[n];
	fill(work,work+n,n);
	while(!can.empty()){
		int t = can.front();
		
		//cout << t << "\n";
		if(!(t&1)){
			int u = t/1000;
			work[u]--;
			if(work[u] == 0){
				pos = u;
				return u;
			}
		}
		can.pop();
		int u = t / 1000;
		int v = (t / 2) % 500;
		int tu = t & 1;
		for(int i = 0;i < N;i++){
			int s;
			
			if(tu == 1){
				if((A[u][i] == 0 && i != u))continue;
				s = g(i,v,0);
			}
			
			if(tu == 0){
				if(A[v][i] == 0) continue;
				s = g(u,i,1);
			}
			
			if(states[s] == 0){
				degree[s]--;
				if(!(s & 1)){
					can.push(s);
					states[s] = 1;
					degree[s] = 0;
					to[s] = t;
				}
				else if(degree[s] == 0){
					can.push(s);
					states[s] = 1;
				}
				
			}
		}
	}

	return -1;
}

int nextMove(int R)
{
    int cur = g(pos,R,0);
    int t = to[cur];
    t /= 1000;
    //cout << t << " " << R << "\n";
    pos = t;
    return t;
}

• Subtask 1: 16 / 16
• Subtask 2: 14 / 14
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40