Submission #552377

#	Time	Username	Problem	Language	Result	Execution time	Memory
552377		QwertyPi	Robots (APIO13_robots)	C++14	0 / 100	1 ms	340 KiB

robots

#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
using namespace std;
typedef pair<int, int> pii;
const int MAXN = 500, MAXM = 500, MAXD = 9;
const int INF = (1 << 25);
char board[MAXN][MAXM];
int dp[MAXN][MAXM][MAXD][MAXD];
int dd[MAXN][MAXM];
pii f[MAXN][MAXM][4];
pii pos[MAXD];

int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, -1, 0, 1};

int d, n, m;
bool in(int i, int j){
	return 0 <= i && i < n && 0 <= j && j < m && board[i][j] != 'x';
}

bool vis[MAXN][MAXM][4];
pii dfs(int i, int j, int dir){
	if(vis[i][j][dir]) return {-1, -1};
	if(f[i][j][dir].fi != -2) return f[i][j][dir];
	vis[i][j][dir] = true;
	if(!in(i + dx[dir], j + dy[dir])){
		f[i][j][dir] = {i, j};
		vis[i][j][dir] = false;
		return {i, j};
	}
	f[i][j][dir] = dfs(i + dx[dir], j + dy[dir], (dir + dd[i + dx[dir]][j + dy[dir]] + 4) % 4);
	vis[i][j][dir] = false;
	return f[i][j][dir];
}

struct CMP{
	bool operator()(pair<pii, pii> a, pair<pii, pii> b){
		return a.fi.se < b.fi.se || a.fi.se == b.fi.se && a.fi.fi > b.fi.fi;
	}
};

int main(){
	cin >> d >> m >> n;
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			cin >> board[i][j];
			if(board[i][j] >= '0' && board[i][j] <= '9') pos[board[i][j] - '1'] = {i, j}, board[i][j] = '.';
			if(board[i][j] == 'C') dd[i][j] = 1;
			if(board[i][j] == 'A') dd[i][j] = -1;
		}
	}
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			for(int dir = 0; dir < 4; dir++){
				f[i][j][dir].fi = -2;
			}
		}
	}
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			for(int dir = 0; dir < 4; dir++){
				if(f[i][j][dir].fi == -2) dfs(i, j, dir);
			}
		}
	}
//	for(int i = 0; i < n; i++){
//		for(int j = 0; j < m; j++){
//			for(int k = 0; k < 4; k++){
//				cout << i << ' ' << j << ' ' << k << ' ' << f[i][j][k].fi << ' ' << f[i][j][k].se << endl;
//			}
//		}
//	}
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			for(int d1 = 0; d1 < d; d1++){
				for(int d2 = d1; d2 < d; d2++){
					dp[i][j][d1][d2] = INF;
				}
			}
		}
	}
	priority_queue<pair<pii, pii>, vector<pair<pii, pii>>, CMP> q;
	for(int i = 0; i < d; i++){
		for(int j = i; j >= 1; j--){
			q.push({{dp[pos[i].fi][pos[i].se][j - 1][i - 1], j - 1}, pos[i]});
		}
		q.push({{0, i}, pos[i]});
		while(!q.empty()){
			pair<pii, pii> v = q.top(); q.pop();
			int cost = v.fi.fi, nd = v.fi.se, x = v.se.fi, y = v.se.se;
			dp[x][y][nd][i] = cost;
			for(int dir = 0; dir < 4; dir++){
				int nx = f[x][y][dir].fi, ny = f[x][y][dir].se;
				if(nx == x && ny == y) continue;
				int co = cost + 1;
				if(co >= dp[nx][ny][nd][i]) continue;
				q.push({{co, nd}, {nx, ny}});
				for(int j = nd; j >= 1; j--){
					if(co + dp[nx][ny][j - 1][nd - 1] >= dp[nx][ny][j - 1][i]) continue;
					dp[nx][ny][j - 1][i] = co + dp[nx][ny][j - 1][nd - 1];
					q.push({{co + dp[nx][ny][j - 1][nd - 1], j - 1}, {nx, ny}});
				}
			}
		}
	}
	
	int ans = INF;
//	for(int d1 = 0; d1 < d; d1++){
//		for(int d2 = d1; d2 < d; d2++){
//			cout << "d " << d1 << ' ' << d2 << endl;
//			for(int i = 0; i < n; i++){
//				for(int j = 0; j < m; j++){
//					cout << (dp[i][j][d1][d2] >= INF ? -1 : dp[i][j][d1][d2]) << ' ';
//				}
//				cout << endl;
//			}
//		}
//	}
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			ans = min(ans, dp[i][j][0][d - 1]);
		}
	}
	cout << (ans >= INF ? -1 : ans) << endl;
}

Compilation message (stderr)

robots.cpp: In member function 'bool CMP::operator()(std::pair<std::pair<int, int>, std::pair<int, int> >, std::pair<std::pair<int, int>, std::pair<int, int> >)':
robots.cpp:40:50: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   40 |   return a.fi.se < b.fi.se || a.fi.se == b.fi.se && a.fi.fi > b.fi.fi;
      |                                                  ^

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40