20151209の宿題です。

20151209/src/enshu_20151209/src/eightpuzzle.cpp

@@ -0,0 +1,145 @@
+#include <iostream>
+#include <queue>
+#include <stack>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+
+using namespace std;
+int where_blank (vector<int> v);
+int eval(vector<int> v);
+vector<int> simulate (vector<int> v);
+vector<int> init_state = {1,2,3,4,0,5,7,8,6};
+vector<int> goal = {1,2,3,4,5,6,7,8,0};
+enum {
+	UP,RIGHT,LEFT,DOWN
+};
+
+int where_blank (vector<int> v)
+{
+	for (int i = 0; i < 9; i++) {
+		if (v[i] == 0) {
+//			cout << i << endl;
+			return i;
+		}
+	}
+}
+
+int eval(vector<int> v)
+{
+	int ret = 0;
+	vector<int> state = simulate(v);
+	for (int i = 0; i < 9; i++) {
+		if (state[i] == goal[i]) {
+			ret++;
+		}
+	}
+	return -(ret + v.size());
+}
+
+vector<int> simulate (vector<int> v)
+{
+	for (int i = 0; i < v.size(); i++) {
+		cout << v[i];
+	}
+	cout << endl;
+	vector<int> state = {1,2,3,4,0,5,7,8,6};
+	for (int i = 0; i < v.size(); i++) {
+		int b = where_blank(state);
+		int num;
+		switch(v[i]) {
+			case UP:
+			num = state[b-3];
+			state[b-3] = 0;
+			state[b] = num;
+			break;
+			case DOWN:
+			num = state[b+3];
+			state[b+3] = 0;
+			state[b] = num;
+			break;
+			case RIGHT:
+			num = state[b+1];
+			state[b+1] = 0;
+			state[b] = num;
+			break;
+			case LEFT:
+			num = state[b-1];
+			state[b-1] = num;
+			state[b-1] = 0;
+			state[b] = num; 
+			break;
+		}
+	}
+	cout << state[0] <<state[1]<<state[2]<<endl<<state[3]<<state[4]<<state[5]<<endl<<state[6]<<state[7]<<state[8]<<endl;
+	return state;
+}
+
+bool is_goal(vector<int> v)
+{
+	for (int i = 0; i < 9; i++) {
+		if (v[i] != goal[i]) {
+			return false;
+		}
+	}
+	return true;
+}
+
+int main()
+{
+	srand(time(NULL));
+	priority_queue<pair<int, vector<int> > > pq;
+	vector<int> init_v = {};
+	pair<int, vector<int> > p = make_pair(eval(init_v), init_v);
+	pq.push(p);
+	while (1) {
+		auto p_top = pq.top();
+		vector<int>state = simulate(p_top.second);
+		pq.pop();
+		int blank = where_blank(state);
+		for(int i = 0; i < p_top.second.size(); i++) {
+//			cout << p_top.second[i] << ",";
+
+		}
+		cout << endl;
+		if (is_goal(state)) {
+			for(int i = 0; i < p_top.second.size(); i++) {
+				cout << p_top.second[i] << ",";
+
+			}
+			cout << endl;
+			return 0;
+		}
+		else {
+			vector<int> temp_v = p_top.second;
+			int temp_eval;
+			if (blank % 3 != 0) {
+				temp_v = p_top.second;
+				temp_v.push_back(LEFT);
+				temp_eval = eval(temp_v);
+				pq.push(make_pair(temp_eval, temp_v));
+			}
+			if (blank % 3 != 2) {
+				temp_v = p_top.second;
+				temp_v.push_back(RIGHT);
+				temp_eval = eval(temp_v);
+				pq.push(make_pair(temp_eval, temp_v));
+			}
+			if (blank > 2) {
+				temp_v = p_top.second;
+				temp_v.push_back(UP);
+				temp_eval = eval(temp_v);
+				pq.push(make_pair(temp_eval, temp_v));
+			}
+			if (blank <6) {
+				temp_v = p_top.second;
+				temp_v.push_back(DOWN);
+				temp_eval = eval(temp_v);
+				pq.push(make_pair(temp_eval, temp_v));
+			}
+		}
+//		getchar();
+	}
+	return 0;
+
+}