oj.uz

Submission #1096704

# Submission time Handle Problem Language Result Execution time Memory
1096704 2024-10-05T02:48:39 Z Captain_Katsura Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 560 ms 151184 KB 
#include <iostream>
#include <cmath>
#include <vector>
#include <stack>
#include <algorithm>
#include <string>
#include <cstring>
#include <iomanip>
#include <queue>
#include <unordered_map>
#include <unordered_set>
#include <set>
#include <tuple>
#include <numeric>
#include <map>
#include <bit>
#include <fstream>
#include <functional>
#include <array>
#include <chrono>
// #include<bits/stdc++.h>

/*–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––*/

using namespace std;

struct pair_hash {
    inline std::size_t operator()(const std::pair<int, int>& v) const {
        return v.first * 31 + v.second;
    }
};

struct custom_hash {
static uint64_t splitmix64(uint64_t x) {
    // http://xorshift.di.unimi.it/splitmix64.c
    x += 0x9e3779b97f4a7c15;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    return x ^ (x >> 31);
}

size_t operator()(uint64_t x) const {
    static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
    return splitmix64(x + FIXED_RANDOM);
}
};

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }

/*–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––*/

#define rep(i, a, n) for(int i = a; i < n; ++i)
#define exists(s, e) (s.find(e) != s.end())
#define def_sort(s) (sort(s.begin(), s.end()))
#define def_reverse(s) (sort(s.rbegin(), s.rend()))
#define lsone(s) (s & -s)
#define endl '\n'

/*–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––*/

const long long INF = 1LL << 62;
using ll = long long;
using ull = unsigned long long;
typedef vector<int> vi;

/*–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––*/

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

const long long MOD = 1e9 + 7;
int rows, cols;

bool ok(int i, int j) {
    return (i >= 0 && j >= 0 && i < rows && j < cols);
}

/*–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––*/

ull read_int() {
    bool minus = false;
    ull result = 0;
    char ch;
    ch = getchar();
    while (true) {
        if (ch == '-') break;
        if (ch >= '0' && ch <= '9') break;
        ch = getchar();
    }
    if (ch == '-') minus = true;
    else result = ch - '0';
    while (true) {
        ch = getchar();
        if (ch < '0' || ch > '9') break;
        result = result * 10 + (ch - '0');
    }
    if (minus)
        return -result;
    else
        return result;
}

template <typename T>
T mod(T a, T b = 1) {
    T rez = a % b;
    if (rez < 0)
        rez += b;
    return rez;
}

void add(ll& a, ll b) {
    a += b;
    if (a >= MOD) a -= MOD;
}

/*–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––*/
char G[4010][4010];
int visited[4010][4010];
int res = 0;
void bfs()
{
    visited[0][0] = 1;
    deque<array<int,3>>pq;
    pq.push_front({1,0,0});
    while (!pq.empty())
    {
        array<int,3>tmp = pq.front();
        char c = G[tmp[1]][tmp[2]];
        res = max(res, tmp[0]);
        pq.pop_front();
        for(int z = 0; z < 4; ++z)
        {
            if(ok(tmp[1] + dx[z], tmp[2] + dy[z]) && !visited[tmp[1] + dx[z]][tmp[2] + dy[z]] && G[tmp[1] + dx[z]][tmp[2] + dy[z]]!= '.')
            {
                if(G[tmp[1] + dx[z]][tmp[2] + dy[z]] == c){
                    pq.push_front({tmp[0],tmp[1] + dx[z],tmp[2] + dy[z]});
                    visited[tmp[1] + dx[z]][tmp[2] + dy[z]] = 1;
                }
                else{
                    pq.push_back({tmp[0] + 1,tmp[1] + dx[z],tmp[2] + dy[z]});
                    visited[tmp[1] + dx[z]][tmp[2] + dy[z]] = 1;             
                }
            }
        }
    } 
    
}
void solve() {
    cin >> rows >> cols;
    memset(visited , 0, sizeof(visited));
    for(int i = 0; i < rows; ++i)
    {
        for(int j = 0; j < cols; ++j)
        cin >> G[i][j];
    }
    bfs();
    cout << res << endl;    
}

int main() {
    std::ios::sync_with_stdio(0), std::cin.tie(0);
#ifdef FIO
    // freopen("div7.in", "r", stdin);
    // freopen("div7.out", "w", stdout);
#endif
    // cout << setprecision(50);

int tc = 1;

#ifdef CF
    //cin >> tc;
#endif

while (tc--)
    solve();
cerr << "Time elapsed:" << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 65360 KB Output is correct
2 Correct 26 ms 63324 KB Output is correct
3 Correct 26 ms 63580 KB Output is correct
4 Correct 31 ms 65464 KB Output is correct
5 Correct 29 ms 64308 KB Output is correct
6 Correct 26 ms 63324 KB Output is correct
7 Correct 27 ms 63580 KB Output is correct
8 Correct 30 ms 63580 KB Output is correct
9 Correct 27 ms 63596 KB Output is correct
10 Correct 27 ms 64348 KB Output is correct
11 Correct 27 ms 64288 KB Output is correct
12 Correct 29 ms 64344 KB Output is correct
13 Correct 28 ms 64344 KB Output is correct
14 Correct 28 ms 64260 KB Output is correct
15 Correct 33 ms 65320 KB Output is correct
16 Correct 39 ms 65356 KB Output is correct
17 Correct 36 ms 65360 KB Output is correct
18 Correct 31 ms 65616 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 78164 KB Output is correct
2 Correct 65 ms 68060 KB Output is correct
3 Correct 248 ms 79080 KB Output is correct
4 Correct 97 ms 70740 KB Output is correct
5 Correct 143 ms 75088 KB Output is correct
6 Correct 560 ms 100428 KB Output is correct
7 Correct 39 ms 78940 KB Output is correct
8 Correct 34 ms 78276 KB Output is correct
9 Correct 31 ms 63220 KB Output is correct
10 Correct 29 ms 63312 KB Output is correct
11 Correct 34 ms 78680 KB Output is correct
12 Correct 30 ms 63732 KB Output is correct
13 Correct 75 ms 68252 KB Output is correct
14 Correct 49 ms 66964 KB Output is correct
15 Correct 44 ms 67200 KB Output is correct
16 Correct 44 ms 64848 KB Output is correct
17 Correct 118 ms 71144 KB Output is correct
18 Correct 93 ms 71160 KB Output is correct
19 Correct 87 ms 70684 KB Output is correct
20 Correct 83 ms 70224 KB Output is correct
21 Correct 158 ms 75348 KB Output is correct
22 Correct 163 ms 75124 KB Output is correct
23 Correct 196 ms 73040 KB Output is correct
24 Correct 157 ms 75600 KB Output is correct
25 Correct 330 ms 78928 KB Output is correct
26 Correct 372 ms 151184 KB Output is correct
27 Correct 474 ms 122444 KB Output is correct
28 Correct 536 ms 100664 KB Output is correct
29 Correct 527 ms 94724 KB Output is correct
30 Correct 501 ms 108240 KB Output is correct
31 Correct 372 ms 76368 KB Output is correct
32 Correct 426 ms 107868 KB Output is correct