Submission #235357

#	Time	Username	Problem	Language	Result	Execution time	Memory
235357		ruler	Cop and Robber (BOI14_coprobber)	C++14	100 / 100	565 ms	7160 KiB

coprobber

// IOI 2021
#include <bits/stdc++.h>
#include "coprobber.h"
using namespace std;

#define endl '\n'
#define ends ' '
#define die(x) return cout << x << endl, 0
#define all(v) v.begin(), v.end()
#define sz(x) (int)(x.size())
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) { cerr << ends << H; debug_out(T...); }
#define debug(...) cerr << "{" << #__VA_ARGS__ << "}:", debug_out(__VA_ARGS__)
typedef long long ll;
typedef pair<int, int> pii;
const int INF = 1e9;
const ll MOD = 1e9 + 7;
 
////////////////////////////////////////////////////////////////////

const int N = MAX_N;

queue< pair<bool, pii> > Q;
bool W[2][N][N];
int C, D[N], S[N][N], P[N][N];

int start(int n, bool A[N][N]) {
	for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) D[i] += (A[i][j]);
	for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) S[i][j] = D[j];
	for (int i = 0; i < n; i++) for (int t = 0; t < 2; t++) Q.push(make_pair(t, make_pair(i, i))), W[t][i][i] = 1, P[i][i] = i;
	while (!Q.empty()) {
		pair<bool, pii> state = Q.front(); Q.pop();
		int t = state.first, c = state.second.first, r = state.second.second;
		if (t) {
			for(int rr = 0; rr < n; rr++) if (A[r][rr] && --S[c][rr] == 0 && !W[0][c][rr]) 
				W[0][c][rr] = 1, Q.push(make_pair(0, make_pair(c, rr)));
		} else {
			for (int cc = 0; cc < n; cc++) if ((c == cc || A[c][cc]) && !W[1][cc][r]) 
				W[1][cc][r] = 1, P[cc][r] = c, Q.push(make_pair(1, make_pair(cc, r)));
		}
	}
	for (int i = 0; i < n; i++) {
		bool f = 1;
		for (int j = 0; j < n; j++) f &= W[1][i][j];
		if (f) return C = i;
	}
	return -1;
}

int nextMove(int R) {
    return C = P[C][R];
}

/*
int main() {

	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	mt19937 Rnd(time(0));


	return 0;
}
*/

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