標籤:
題目串連
http://www.lydsy.com/JudgeOnline/problem.php?id=1054
移動玩具Description
在一個4*4的方框內擺放了若干個相同的玩具,某人想將這些玩具重新擺放成為他心中理想的狀態,規定移動時只能將玩具向上下左右四個方向移動,並且移動的位置不能有玩具,請你用最少的移動次數將初始的玩具狀態移動到某人心中的目標狀態。
Input
前4行表示玩具的初始狀態,每行4個數字1或0,1表示方格中放置了玩具,0表示沒有放置玩具。接著是一個空行。接下來4行表示玩具的目標狀態,每行4個數字1或0,意義同上。
Output
一個整數,所需要的最少移動次數。
Sample Input
1111
0000
1110
0010
1010
0101
1010
0101
Sample Output
4
資料很小直接暴搜。。
#include<algorithm>#include<iostream>#include<cstdlib>#include<cstring>#include<cstdio>#include<vector>#include<map>using std::min;using std::sort;using std::pair;using std::swap;using std::vector;using std::multimap;#define pb(e) push_back(e)#define sz(c) (int)(c).size()#define mp(a, b) make_pair(a, b)#define all(c) (c).begin(), (c).end()#define iter(c) __typeof((c).begin())#define cls(arr, val) memset(arr, val, sizeof(arr))#define cpresent(c, e) (find(all(c), (e)) != (c).end())#define rep(i, n) for(int i = 0; i < (int)n; i++)#define tr(c, i) for(iter(c) i = (c).begin(); i != (c).end(); ++i)const int N = 1000000;const int INF = 0x3f3f3f3f;bool vis[N];struct Node { int s; bool mat[4][4];}que[N], end;const int dx[] = { 0, 0, -1, 1 }, dy[] = { -1, 1, 0, 0 };inline int hash(Node &x) { int ret = 0, k = 1; rep(i, 4) { rep(j, 4) { ret += k * x.mat[i][j]; k <<= 1; } } return (ret + N) % N;}inline void read(Node &x) { char buf[10]; rep(i, 4) { scanf("%s", buf); rep(j, 4) { x.mat[i][j] = buf[j] - ‘0‘; } }}void bfs() { int lb = 0, ub = 0, ret, ans; ret = hash(que[0]), ans = hash(end); if(ret == ans) { puts("0"); return; } ub++, cls(vis, false), vis[ret] = true; while(lb != ub) { Node &x = que[lb++]; ret = hash(x); if(ret == ans) { printf("%d\n", x.s); return; } rep(i, 4) { rep(j, 4) { if(!x.mat[i][j]) continue; rep(k, 4) { int nx = dx[k] + i, ny = dy[k] + j; if(nx < 0 || nx >= 4 || ny < 0 || ny >= 4) continue; if(x.mat[nx][ny]) continue; Node &t = que[ub]; t = x, t.s = x.s + 1; swap(t.mat[i][j], t.mat[nx][ny]); ret = hash(t); if(vis[ret]) continue; vis[ret] = true; ub++; } } } } puts("0");}int main() {#ifdef LOCAL freopen("in.txt", "r", stdin); freopen("out.txt", "w+", stdout);#endif read(que[0]), read(end); bfs(); return 0;}
bzoj 1054 移動玩具