oj.uz

Submission #720794

# Submission time Handle Problem Language Result Execution time Memory
720794 2023-04-09T10:36:27 Z Lextyle Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 720 ms 119392 KB 
#include <bits/stdc++.h>
#pragma warning(disable : 4996)
#pragma warning(disable : 6031)
#define USACO freopen("exercise.in", "r", stdin); freopen("exercise.out", "w+", stdout)
#define fastIO ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define ll long long
using namespace std;

ll binpow(ll a, ll x, ll m) {
	ll ans = 1, md = a % m;
	while (x != 0) {
		if (x % 2 == 1) ans = (ans * md) % m;
		md = (md * md) % m;
		x >>= 1;
	}
	return ans;
}
ll gcd(ll a, ll b) {
	return b == 0 ? a : gcd(b, a % b);
}
ll lcm(ll a, ll b) {
	return a * b / gcd(a, b);
}
bool ok(int r, int c, int n, int m) {
	return r >= 0 && r < n && c >= 0 && c < m;
}
/*
*/
char a[4000][4000];
int d[4000][4000];

void solve() {
	int n, m;
	cin >> n >> m;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) cin >> a[i][j];
	}
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) d[i][j] = INT32_MAX;
	}
	d[0][0] = 1;
	deque<pair<int, int>> s;
	s.push_front({ 0, 0 });
	while (!s.empty()) {
		int r = s.front().first, c = s.front().second;
		s.pop_front();
		if (ok(r - 1, c, n, m) && a[r - 1][c] != '.' && d[r][c] + (a[r][c] != a[r - 1][c]) < d[r - 1][c]) {
			d[r - 1][c] = d[r][c] + (a[r][c] != a[r - 1][c]);
			if (a[r][c] != a[r - 1][c]) s.push_back({ r - 1, c });
			else s.push_front({ r - 1, c });
		}
		if (ok(r + 1, c, n, m) && a[r + 1][c] != '.' && d[r][c] + (a[r][c] != a[r + 1][c]) < d[r + 1][c]) {
			d[r + 1][c] = d[r][c] + (a[r][c] != a[r + 1][c]);
			if (a[r][c] != a[r + 1][c]) s.push_back({ r + 1, c });
			else s.push_front({ r + 1, c });
		}
		if (ok(r, c - 1, n, m) && a[r][c - 1] != '.' && d[r][c] + (a[r][c] != a[r][c - 1]) < d[r][c - 1]) {
			d[r][c - 1] = d[r][c] + (a[r][c] != a[r][c - 1]);
			if (a[r][c] != a[r][c - 1]) s.push_back({ r, c - 1 });
			else s.push_front({ r, c - 1 });
		}
		if (ok(r, c + 1, n, m) && a[r][c + 1] != '.' && d[r][c] + (a[r][c] != a[r][c + 1]) < d[r][c + 1]) {
			d[r][c + 1] = d[r][c] + (a[r][c] != a[r][c + 1]);
			if (a[r][c] != a[r][c + 1]) s.push_back({ r, c + 1 });
			else s.push_front({ r, c + 1 });
		}
	}
	int mx = 0;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (a[i][j] != '.') mx = max(mx, d[i][j]);
		}
	}
	cout << mx << "\n";
}

int main() {
	//USACO;
	fastIO;
	solve();
}

Compilation message

tracks.cpp:2: warning: ignoring '#pragma warning ' [-Wunknown-pragmas]
    2 | #pragma warning(disable : 4996)
      | 
tracks.cpp:3: warning: ignoring '#pragma warning ' [-Wunknown-pragmas]
    3 | #pragma warning(disable : 6031)
      |

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 5204 KB Output is correct
2 Correct 1 ms 456 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 8 ms 5156 KB Output is correct
5 Correct 4 ms 3024 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 2 ms 1108 KB Output is correct
10 Correct 3 ms 2520 KB Output is correct
11 Correct 3 ms 2132 KB Output is correct
12 Correct 6 ms 3024 KB Output is correct
13 Correct 5 ms 3032 KB Output is correct
14 Correct 4 ms 3024 KB Output is correct
15 Correct 13 ms 5384 KB Output is correct
16 Correct 14 ms 5336 KB Output is correct
17 Correct 11 ms 5228 KB Output is correct
18 Correct 10 ms 5128 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 30676 KB Output is correct
2 Correct 58 ms 16612 KB Output is correct
3 Correct 337 ms 79168 KB Output is correct
4 Correct 95 ms 30216 KB Output is correct
5 Correct 241 ms 59500 KB Output is correct
6 Correct 695 ms 92572 KB Output is correct
7 Correct 15 ms 32108 KB Output is correct
8 Correct 15 ms 30672 KB Output is correct
9 Correct 2 ms 596 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 13 ms 31460 KB Output is correct
12 Correct 1 ms 1620 KB Output is correct
13 Correct 51 ms 16632 KB Output is correct
14 Correct 29 ms 11340 KB Output is correct
15 Correct 29 ms 12368 KB Output is correct
16 Correct 23 ms 6236 KB Output is correct
17 Correct 135 ms 32520 KB Output is correct
18 Correct 116 ms 31964 KB Output is correct
19 Correct 100 ms 30252 KB Output is correct
20 Correct 90 ms 28108 KB Output is correct
21 Correct 215 ms 61628 KB Output is correct
22 Correct 227 ms 59400 KB Output is correct
23 Correct 246 ms 49796 KB Output is correct
24 Correct 204 ms 61028 KB Output is correct
25 Correct 579 ms 79220 KB Output is correct
26 Correct 503 ms 119392 KB Output is correct
27 Correct 592 ms 96816 KB Output is correct
28 Correct 720 ms 92560 KB Output is correct
29 Correct 695 ms 92704 KB Output is correct
30 Correct 662 ms 92220 KB Output is correct
31 Correct 501 ms 63972 KB Output is correct
32 Correct 547 ms 94700 KB Output is correct