oj.uz

Submission #46881

# Submission time Handle Problem Language Result Execution time Memory
46881 2018-04-24T13:56:51 Z cheater2k Robots (APIO13_robots) C++17
30 / 100
 542 ms 122496 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 505;
const int INF = 1e9;
const int dx[] = {-1, 0, +1, 0};
const int dy[] = {0, +1, 0, -1};

int n, r, c;
char a[N][N];
int dis[N][N][10][10];
pair<int,int> dest[N][N][4];

struct state { 
	int dis; int x; int y; int l; int r; 
	bool operator < (const state &other) const {
		return dis > other.dis;
	}
};

bool inside(int x, int y) { return x >= 1 && x <= r && y >= 1 && y <= c; }

pair<int,int> dfs(int x, int y, int dir) {
	if (dest[x][y][dir] != make_pair(0,0)) return dest[x][y][dir];
	int ndir = dir;
	if (a[x][y] == 'A') ndir = (dir + 3) % 4;
	if (a[x][y] == 'C') ndir = (dir + 1) % 4;	
	int nx = x + dx[ndir], ny = y + dy[ndir];
	if (!inside(nx, ny) || a[nx][ny] == 'x') {
		return dest[x][y][dir] = {x,y};
	}
	return dest[x][y][dir] = dfs(nx, ny, ndir);
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);

	cin >> n >> c >> r;
	for (int i = 1; i <= r; ++i) {
		for (int j = 1; j <= c; ++j) {
			cin >> a[i][j];
		}
	}
	
	// calculate dest[][][]
	for (int i = 1; i <= r; ++i) {
		for (int j = 1; j <= c; ++j) {
			for (int dir = 0; dir < 4; ++dir) {
				if (dest[i][j][dir] == make_pair(0,0)) {
					dfs(i, j, dir);
				}
			//	cerr << "dest " << i << ' ' << j << ' ' << dir << " -> " << dest[i][j][dir].first << ' ' << dest[i][j][dir].second << endl;
			}
		}
	}	
	
	// BFS
	priority_queue <state> q;
	for (int i = 1; i <= r; ++i) for (int j = 1; j <= c; ++j) {
		for (int l = 1; l <= n; ++l) for (int r = 1; r <= n; ++r) {
			dis[i][j][l][r] = INF;
		}
	}
	for (int i = 1; i <= r; ++i) for (int j = 1; j <= c; ++j) {
		if (a[i][j] >= '1' && a[i][j] <= '9') {
			dis[i][j][a[i][j] - '0'][a[i][j] - '0'] = 0;
			q.push({0, i, j, a[i][j] - '0', a[i][j] - '0'});
		}
	}

	while(!q.empty()) {
		auto t = q.top(); q.pop();
		int x = t.x, y = t.y, l = t.l, r = t.r;
		if (l == 1 && r == n) {
			printf("%d\n", dis[x][y][l][r]); return 0;
		}
		if (t.dis != dis[x][y][l][r]) continue;
		
		//cerr << x << ' ' << y << "[" << l << ' ' << r << "] -> " << dis[x][y][l][r] << endl;

		// push
		for (int dir = 0; dir < 4; ++dir) {
			int nx = dest[x][y][dir].first, ny = dest[x][y][dir].second;
			if (dis[nx][ny][l][r] > dis[x][y][l][r] + 1) {
				dis[nx][ny][l][r] = dis[x][y][l][r] + 1;
				q.push({dis[nx][ny][l][r], nx, ny, l, r});
			};
		}

		// merge
		for (int k = 1; k <= l - 1; ++k) if (dis[x][y][k][l - 1] != INF) {
			if (dis[x][y][k][r] > dis[x][y][l][r] + dis[x][y][k][l - 1]) {
				dis[x][y][k][r] = dis[x][y][l][r] + dis[x][y][k][l - 1];
				q.push({dis[x][y][k][r], x, y, k, r});
			}
		}
		for (int k = r + 1; k <= n; ++k) if (dis[x][y][r + 1][k] != INF) {
			if (dis[x][y][l][k] > dis[x][y][l][r] + dis[x][y][r + 1][k]) {
				dis[x][y][l][k] = dis[x][y][l][r] + dis[x][y][r + 1][k];
				q.push({dis[x][y][l][k], x, y, l, k});
			}
		}
	}
	
	printf("-1\n");
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 616 KB Output is correct
3 Correct 2 ms 616 KB Output is correct
4 Correct 2 ms 708 KB Output is correct
5 Correct 2 ms 812 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 616 KB Output is correct
3 Correct 2 ms 616 KB Output is correct
4 Correct 2 ms 708 KB Output is correct
5 Correct 2 ms 812 KB Output is correct
6 Correct 2 ms 812 KB Output is correct
7 Correct 2 ms 812 KB Output is correct
8 Correct 2 ms 812 KB Output is correct
9 Correct 2 ms 812 KB Output is correct
10 Correct 2 ms 864 KB Output is correct

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 616 KB Output is correct
3 Correct 2 ms 616 KB Output is correct
4 Correct 2 ms 708 KB Output is correct
5 Correct 2 ms 812 KB Output is correct
6 Correct 2 ms 812 KB Output is correct
7 Correct 2 ms 812 KB Output is correct
8 Correct 2 ms 812 KB Output is correct
9 Correct 2 ms 812 KB Output is correct
10 Correct 2 ms 864 KB Output is correct
11 Correct 369 ms 51020 KB Output is correct
12 Correct 31 ms 51020 KB Output is correct
13 Correct 38 ms 51020 KB Output is correct
14 Runtime error 542 ms 122496 KB Execution killed with signal 11 (could be triggered by violating memory limits)
15 Halted 0 ms 0 KB -

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 616 KB Output is correct
3 Correct 2 ms 616 KB Output is correct
4 Correct 2 ms 708 KB Output is correct
5 Correct 2 ms 812 KB Output is correct
6 Correct 2 ms 812 KB Output is correct
7 Correct 2 ms 812 KB Output is correct
8 Correct 2 ms 812 KB Output is correct
9 Correct 2 ms 812 KB Output is correct
10 Correct 2 ms 864 KB Output is correct
11 Correct 369 ms 51020 KB Output is correct
12 Correct 31 ms 51020 KB Output is correct
13 Correct 38 ms 51020 KB Output is correct
14 Runtime error 542 ms 122496 KB Execution killed with signal 11 (could be triggered by violating memory limits)
15 Halted 0 ms 0 KB -