Submission #59574

#	Time	Username	Problem	Language	Result	Execution time	Memory
59574		Benq	Cop and Robber (BOI14_coprobber)	C++11	100 / 100	665 ms	7644 KiB

coprobber

#include "coprobber.h"

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;

template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define F0R(i, a) for (int i=0; i<(a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)

#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

const int MOD = 1000000007;
const ll INF = 1e18;
const int MX = 500;
// const int MAX_N = 500;

int N, st, in[MX][MX];
bitset<MX> adj[MX];
int dist[MX][MX][2];

int start(int n, bool A[MAX_N][MAX_N]) {
	N = n;
	F0R(i,N) F0R(j,N) {
		adj[i][j] = A[i][j];
		dist[i][j][0] = dist[i][j][1] = MOD;
	}
	queue<array<int,3>> q;
	F0R(i,N) F0R(j,2) {
		dist[i][i][j] = 0;
		q.push({i,i,j});
	}
	F0R(i,N) F0R(j,N) in[i][j] = adj[j].count();
	while (sz(q)) {
		auto a = q.front(); q.pop();
		int cdist = dist[a[0]][a[1]][a[2]];
		if (a[2] == 1) {
			F0R(i,N) if ((i == a[0] || adj[i][a[0]]) && dist[i][a[1]][0] == MOD) {
				dist[i][a[1]][0] = cdist+1;
				q.push({i,a[1],0});
			}
		} else {
			F0R(i,N) if (adj[a[1]][i] && dist[a[0]][i][1] == MOD) {
				in[a[0]][i] --;
				if (in[a[0]][i] == 0) {
					dist[a[0]][i][1] = cdist+1;
					q.push({a[0],i,1});
				}
			}
		}
	}

    //F0R(i,N) F0R(j,N) F0R(k,2) cout << i << " " << j << " " << k << " " << dist[i][j][k] << "\n";
	F0R(i,N) {
		bool ok = 1;
		F0R(j,N) if (dist[i][j][0] == MOD) ok = 0;
		if (ok) return st = i;
	}
	return -1;
}

int nextMove(int R) {
	F0R(i,N) if (i == st || adj[st][i])
		if (dist[i][R][1] < dist[st][R][0])
			return st = i;
	return -1;
}

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