Submission #1001755

#	Time	Username	Problem	Language	Result	Execution time	Memory
1001755		vjudge1	Robots (APIO13_robots)	C++17	0 / 100	0 ms	348 KiB

robots

#include <bits/stdc++.h>

using namespace std;
using ll  =  long long;

#ifdef U_U
#include "algo/debug.h"
#else
#define deb(x...) 42
#endif
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pb push_back
#define szof(x) (int)x.size()
#define int ll
#define love bool

template<class T> void MIN(T& a, const T b) { b < a ? a = b, 1 : 0; }
template<class T> void MAX(T& a, const T b) { a < b ? a = b, 1 : 0; }

const int mod = 1e9 + 7;
const int N = 2e5 + 5;
const int inf = 2147483647;
const int INF = 9223372036854775807;
const int dx[] = {1, -1, 0, 0};
const int dy[] = {0, 0, 1, -1};
// Follow the white rabbit.

int n, w, h;
char e[505][505];
int dist[505][505];
void ka () {
	cin >> n >> w >> h;
	pair <int, int> first = {0ll, 0ll}, second;
	for (int i = 1; i <= h; i ++) {
		for (int j = 1; j <= w; j ++) {
			cin >> e[i][j];
			if (e[i][j] >= '1' && e[i][j] <= '9') {
				if (first == make_pair(0ll, 0ll)) first = make_pair(i, j);
				else second = {i, j};
			}
		}
	}
	if (first.first > second.first) swap(first, second);
	if (first.first != 1ll || second.first != 2ll) cout << -1;
	else {
		queue <pair <int, int> > q;
		q.push(first);
		for (int i = 1; i <= h; i ++) for (int j = 1; j <= w; j ++) dist[i][j] = inf;
		dist[first.first][first.second] = 0;
		while (szof(q)) {
			pair <int, int> v = q.front();
			q.pop();
			for (int k = 0; k < 4; k ++) {
				int x = dx[k] + v.first, y = dy[k] + v.second;
				if (x > h || x < 1 || y > w || y < 0 || e[x][y] == 'x') continue;
				if (dist[x][y] <= dist[v.first][v.second] + 1) continue;
				dist[x][y] = dist[v.first][v.second] + 1;
				q.push({x, y});
			}
		}
		cout << dist[second.first][second.second];
	}
}

const bool overflow = 0;

main() {
  //freopen("haircut.in"	, "r", stdin); freopen("haircut.out", "w", stdout);
  cout.setf(ios::fixed);cout.precision(12);
  ios_base::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);
  int tc = 1; 
  if (overflow) cin >> tc;
  for (int cs = 1; cs <= tc; cs ++) {
		#ifdef U_U
		cout << ":D\n";
		#endif
		ka();
		//if (cs != tc) cout << '\n';
  }
}

Compilation message (stderr)

robots.cpp:68:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   68 | main() {
      | ^~~~

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