#include "coprobber.h"
#include <bits/stdc++.h>
using namespace std;
const int maxN = 500;
const int M = 2 * maxN * maxN;
vector<int> g[maxN];
vector<int> g2[M], rev2[M];
//0 if it's officer's turn, 1 if robber's one
int enc(int officerPos, int robberPos, int whoseTurn) {
return whoseTurn * maxN * maxN + officerPos * maxN + robberPos;
}
char vis[M];
int good[M];
int d[M];
void expand(int cur) {
if (cur / (maxN * maxN) && d[cur] == g2[cur].size())
good[cur] = g2[cur].empty() ? -2 : g2[cur][0];
else if (cur / (maxN * maxN) == 0 && (d[cur] || g2[cur].size() == 0)) {
good[cur] = -2;
for (int i : g2[cur])
if (good[i] != -1) {
good[cur] = i;
break;
}
}
if (good[cur] != -1)
for (int i : rev2[cur])
if (good[i] == -1) {
d[i]++;
expand(i);
}
}
void add(int v, int u) {
g2[v].push_back(u);
rev2[u].push_back(v);
}
int loc;
int start(int N, bool A[MAX_N][MAX_N]) {
memset(good, -1, sizeof good);
memset(d, 0, sizeof d);
for (int i = 0; i < N; i++)
for (int j = 0; j < N; j++)
if (A[i][j])
g[i].push_back(j);
for (int i = 0; i < N; i++)
for (int j = 0; j < N; j++)
if (i != j) {
add(enc(i, j, 0), enc(i, j, 1));
for (int k : g[i])
add(enc(i, j, 0), enc(k, j, 1));
for (int k : g[j])
add(enc(i, j, 1), enc(i, k, 0));
}
for (int i = 0; i < N; i++) {
expand(enc(i, i, 0));
expand(enc(i, i, 1));
}
for (int i = 0; i < N; i++) {
bool no = 0;
for (int j = 0; j < N; j++)
no |= good[enc(i, j, 0)] == -1;
if (!no) {
loc = i;
return i;
}
}
return -1;
}
int nextMove(int R) {
//cout << loc << " " << R << endl;
loc = good[enc(loc, R, 0)] % (maxN * maxN) / maxN;
return loc;
}
