제출 #107632

#제출 시각아이디문제언어결과실행 시간메모리
107632dfistric경찰관과 강도 (BOI14_coprobber)C++14
30 / 100
94 ms1912 KiB
#include "coprobber.h" #include <bits/stdc++.h> #define FOR(i, a, b) for (int i = (a); i < (b); i++) #define FORd(i, a, b) for (int i = (a); i >= (b); i--) #define REP(i, n) FOR(i, 0, n) #define ll long long using namespace std; int strategy; int n; vector <int> ve[MAX_N]; int D[MAX_N], F[MAX_N]; int disc = -1; int P, W, H; const int MAXN = 110; int dp[MAXN][MAXN]; int mv[MAXN][MAXN]; int rek(int x, int y) { if (x == y) return 1; if (dp[x][y] != -1) return dp[x][y]; dp[x][y] = 0; int ma = 1; for (int b : ve[y]) { ma = min(ma, rek(x, b)); } if (ma == 1) { mv[x][y] = x; dp[x][y] = 1; return 1; } for (int a : ve[x]) { int ma = 1; for (int b : ve[y]) { ma = min(ma, rek(a, b)); } if (ma == 1) { mv[x][y] = a; dp[x][y] = 1; return 1; } } return 0; } void dfs(int x, int p) { D[x] = ++disc; for (int y : ve[x]) { if (y == p) continue; dfs(y, x); } F[x] = disc; return; } int start(int N, bool A[MAX_N][MAX_N]) { n = N; int e = 0; REP(i, n) { REP(j, n) { if (A[i][j]) ve[i].push_back(j), e++; } } e /= 2; if (e == n - 1) { dfs(0, 0); strategy = 0, P = 0; return 0; } W = 1, H = 1; while (A[W - 1][W] == 1) W++; H = n / W; if (e == ((W - 1) * H + (H - 1) * W)) { strategy = 1, P = 0; return P; } strategy = 2; REP(i, n) { int sol = 1; REP(j, n) { sol = min(sol, rek(i, j)); } if (sol == 1) { P = i; return P; } } return -1; } int nextMove(int R) { if (strategy == 0) { for (int x : ve[P]) { if (D[x] < D[P]) continue; if (D[x] <= D[R] && F[R] <= F[x]) { P = x; return P; } } assert(0); } else if (strategy == 1) { if (abs((R % W) - (P % W)) == 1 && abs((R / W) - (P / W)) == 1) return P; if (R % W == P % W) { if (R > P) P += W; else P -= W; return P; } else if (abs((R % W) - (P % W)) == 1) { if (R / W == P / W) { if (R > P) P++; else P--; return P; } else { if (R > P) P += W; else P -= W; return P; } } else { if (R % W > P % W) P++; else P--; return P; } } else { P = mv[P][R]; return P; } return 0; }
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