oj.uz

Submission #900355

# Submission time Handle Problem Language Result Execution time Memory
900355 2024-01-08T07:49:26 Z Nelt Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 558 ms 236392 KB 
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,avx2,fma,popcnt")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

/* DEFINES */
#define S second
#define F first
#define ll long long
#define ull unsigned long long
#define ld long double
#define npos ULLONG_MAX
#define INF LLONG_MAX
#define vv(a) vector<a>
#define pp(a, b) pair<a, b>
#define pq(a) priority_queue<a>
#define qq(a) queue<a>
#define ss(a) set<a>
#define mm(a, b) map<a, b>
#define ump(a, b) unordered_map<a, b>
#define ANDROID                   \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0);
#define elif else if
#define endl "\n"
#define allc(a) begin(a), end(a)
#define all(a) a, a + sizeof(a) / sizeof(a[0])
#define pb push_back
#define logi(a) __lg(a)
#define sqrt(a) sqrtl(a)
#define mpr make_pair
#define ins insert
using namespace std;
using namespace __gnu_pbds;
using namespace __cxx11;
typedef char chr;
typedef basic_string<chr> str;
template <typename T, typename key = less<T>>
using ordered_set = tree<T, null_type, key, rb_tree_tag, tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll N = 4005;
ll dist[N][N];
str s[N];
ll n, m;
ll dx[] = {1, -1, 0, 0}, dy[] = {0, 0, 1, -1};
bool can_go(ll x, ll y)
{
    return x > 0 and x <= n and y > 0 and y <= m and s[x][y] != '.';
}
void bfs()
{
    deque<pp(ll, ll)> q;
    for (ll i = 1; i <= n; i++)
        for (ll j = 1; j <= m; j++)
            dist[i][j] = 1e9;
    dist[1][1] = 0;
    q.pb(mpr(1, 1));
    while (!q.empty())
    {
        auto [x, y] = q.front();
        q.pop_front();
        for (ll k = 0; k < 4; k++)
            if (can_go(x + dx[k], y + dy[k]) and dist[x + dx[k]][y + dy[k]] > dist[x][y] + (s[x][y] != s[x + dx[k]][y + dy[k]]))
            {
                dist[x + dx[k]][y + dy[k]] = dist[x][y] + (s[x][y] != s[x + dx[k]][y + dy[k]]);
                if (s[x][y] != s[x + dx[k]][y + dy[k]])
                    q.pb(mpr(x + dx[k], y + dy[k]));
                else
                    q.push_front(mpr(x + dx[k], y + dy[k]));
            }
    }
}
void solve()
{
    cin >> n >> m;
    for (ll i = 1; i <= n; i++)
        cin >> s[i], s[i] = ' ' + s[i];
    bfs();
    ll ans = 0;
    for (ll i = 1; i <= n; i++)
    for (ll j = 1; j <= m; j++)
        if (s[i][j] != '.')
        ans = max(ans, dist[i][j]);
    cout << ans + 1 << endl;
}
/*

*/
int main()
{
    ANDROID
    // precomp();
    ll t = 1;
    // cin >> t;
    for (ll i = 1; i <= t; i++)
        // cout << "Case #" << i << ": ",
        solve();
    cerr << "\nTime elapsed : " << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n";
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 17500 KB Output is correct
2 Correct 1 ms 2648 KB Output is correct
3 Correct 1 ms 2640 KB Output is correct
4 Correct 6 ms 17628 KB Output is correct
5 Correct 3 ms 10844 KB Output is correct
6 Correct 1 ms 2652 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2652 KB Output is correct
9 Correct 1 ms 4700 KB Output is correct
10 Correct 3 ms 8800 KB Output is correct
11 Correct 3 ms 8796 KB Output is correct
12 Correct 5 ms 11100 KB Output is correct
13 Correct 3 ms 10844 KB Output is correct
14 Correct 3 ms 10940 KB Output is correct
15 Correct 10 ms 17500 KB Output is correct
16 Correct 11 ms 17644 KB Output is correct
17 Correct 8 ms 17508 KB Output is correct
18 Correct 7 ms 17748 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 121692 KB Output is correct
2 Correct 35 ms 44788 KB Output is correct
3 Correct 151 ms 157316 KB Output is correct
4 Correct 54 ms 67704 KB Output is correct
5 Correct 102 ms 112456 KB Output is correct
6 Correct 536 ms 184504 KB Output is correct
7 Correct 16 ms 125788 KB Output is correct
8 Correct 13 ms 121716 KB Output is correct
9 Correct 2 ms 2744 KB Output is correct
10 Correct 1 ms 2660 KB Output is correct
11 Correct 14 ms 123592 KB Output is correct
12 Correct 2 ms 6756 KB Output is correct
13 Correct 32 ms 44772 KB Output is correct
14 Correct 19 ms 31164 KB Output is correct
15 Correct 15 ms 35440 KB Output is correct
16 Correct 15 ms 16300 KB Output is correct
17 Correct 79 ms 72268 KB Output is correct
18 Correct 55 ms 72100 KB Output is correct
19 Correct 58 ms 67668 KB Output is correct
20 Correct 39 ms 62812 KB Output is correct
21 Correct 98 ms 117396 KB Output is correct
22 Correct 100 ms 112700 KB Output is correct
23 Correct 145 ms 95932 KB Output is correct
24 Correct 91 ms 116932 KB Output is correct
25 Correct 378 ms 157364 KB Output is correct
26 Correct 301 ms 236392 KB Output is correct
27 Correct 401 ms 210568 KB Output is correct
28 Correct 558 ms 184528 KB Output is correct
29 Correct 531 ms 181196 KB Output is correct
30 Correct 470 ms 190188 KB Output is correct
31 Correct 362 ms 122112 KB Output is correct
32 Correct 383 ms 187904 KB Output is correct