HDU 4801 Pocket Cube (模擬)
阿新 • • 發佈:2019-01-11
題意:
給出一個2階魔方,問在少於N步旋轉內,最多產生多少個同樣顏色的面?
思路:
共6個有效方向,模擬即可。
有一個坑點,顏色不是0-5的,是 Integer 。判重時注意下即可
程式碼:
#include <bits/stdc++.h> using namespace std; int n, fans; int dirx[6][8] = { { 0,2,6,12,16,18,20,22 }, { 4,5,6,7,8,9,23,22 }, { 0,1,9,15,19,18,10,4 }, { 1,3,7,13,17,19,21,23 }, { 10,11,12,13,14,15,21,20 }, { 2,3,8,14,17,16,11,5 } }; int diry[6][4] = { { 5,11,10,4 }, { 2,3,1,0 }, { 23,21,20,22 }, { 8,14,15,9 }, { 16,17,19,18 }, { 7,13,12,6 } }; int check[6][4] = { { 0,1,2,3 }, { 4,5,10,11 }, { 6,7,12,13 }, { 8,9,14,15 }, { 16,17,18,19 }, { 23,21,20,22 } }; int a[24], b[24]; void debug() { for (int i = 0; i < 24; i++) { cout << a[i] << ' '; } cout << endl; } bool make(int t) { for (int i = 0; i < 24; i++) b[i] = a[i]; for (int i = 0; i < 8; i++) { b[dirx[t][i]] = a[(dirx[t][(i + 2) % 8])]; } for (int i = 0; i < 4; i++) { b[diry[t][i]] = a[(diry[t][(i + 1) % 4])]; } for (int i = 0; i < 8; i++) { a[dirx[t][i]] = b[dirx[t][i]]; } for (int i = 0; i < 4; i++) { a[diry[t][i]] = b[diry[t][i]]; } return 1; } int che() { int ans = 0; for (int i = 0; i < 6; i++) { bool ok = 1; for (int j = 0; j < 3; j++) { if (a[check[i][j]] != a[check[i][j + 1]]) ok = 0; } ans += ok; } return ans; } void remake(int t) { for (int i = 0; i < 24; i++) b[i] = a[i]; for (int i = 0; i < 8; i++) { b[dirx[t][i]] = a[(dirx[t][(i + 6) % 8])]; } for (int i = 0; i < 4; i++) { b[diry[t][i]] = a[(diry[t][(i + 3) % 4])]; } for (int i = 0; i < 8; i++) { a[dirx[t][i]] = b[dirx[t][i]]; } for (int i = 0; i < 4; i++) { a[diry[t][i]] = b[diry[t][i]]; } } void dfs(int dep, int di) { if (dep == 0 || fans == 6) return; for (int i = 0; i < 6; i++) { if ((i + 3) % 6 != di && fans != 6 && make(i)) { fans = max(che(), fans); dfs(dep - 1, i); remake(i); } } } int main() { while (scanf("%d", &n) != -1) { fans = 0; for (int i = 0; i < 24; i++) { scanf("%d", &a[i]); b[i] = a[i]; } fans = max(fans, che()); dfs(n,-1); printf("%d\n", fans); } }