oj.uz

답안 #842508

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
842508 2023-09-03T01:46:05 Z saturina Tracks in the Snow (BOI13_tracks) C++14
100 / 100
 548 ms 241232 KB 
//made by Nguyễn Hồng Nam
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
const ll mod = 1e9 + 7,inf = 1e18,mxn = 4005;
#define pll pair<ll,ll>
#define fi first
#define se second
deque<pll> q;
ll d[mxn][mxn],h,w,row[4] = {-1,0,0,1},col[4] = {0,-1,1,0},ans = 1;
string s[mxn];
void maxz(ll &a,ll b)
{
    if(a < b) a= b;
}
bool check(ll i,ll j)
{
    if(i >= 0 && i < h && j >= 0 && j < w && s[i][j] != '.') return true;
    return false;
}
void bfs01()
{
    d[0][0] = 1;
    q.push_back({0,0});
    while(!q.empty())
    {
        pll mx = q.front();
        maxz(ans,d[mx.fi][mx.se]);
        q.pop_front();
        for(ll i = 0; i < 4; i++)
        {
            ll a = mx.fi + row[i],b = mx.se + col[i];
            if(check(a,b) && d[a][b] == 0)
            {
                if(s[a][b] == s[mx.fi][mx.se])
                {
                    d[a][b] = d[mx.fi][mx.se];
                    q.push_front({a,b});
                }
                else
                {
                    d[a][b] = d[mx.fi][mx.se] + 1;
                    q.push_back({a,b});
                }
            }
        }
    }
}
int main()
{
#define taskname "track"
    if (fopen(taskname".inp", "r"))
    {
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    cin.tie(0)->sync_with_stdio(0);
    cin >> h >> w;
    for(ll i = 0; i < h; i++)
    {
        cin >> s[i];
    }
    bfs01();
    cout << ans << '\n';
    return 0;
}

Compilation message

tracks.cpp: In function 'int main()':
tracks.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
tracks.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 4956 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 0 ms 604 KB Output is correct
4 Correct 5 ms 4444 KB Output is correct
5 Correct 2 ms 2392 KB Output is correct
6 Correct 0 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 860 KB Output is correct
9 Correct 1 ms 852 KB Output is correct
10 Correct 3 ms 1884 KB Output is correct
11 Correct 2 ms 1884 KB Output is correct
12 Correct 5 ms 2692 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 2 ms 2396 KB Output is correct
15 Correct 8 ms 4532 KB Output is correct
16 Correct 10 ms 4956 KB Output is correct
17 Correct 7 ms 4700 KB Output is correct
18 Correct 6 ms 4444 KB Output is correct

Subtask #2
70.0 / 70.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 16220 KB Output is correct
2 Correct 30 ms 15156 KB Output is correct
3 Correct 158 ms 93524 KB Output is correct
4 Correct 55 ms 43348 KB Output is correct
5 Correct 103 ms 69256 KB Output is correct
6 Correct 540 ms 189368 KB Output is correct
7 Correct 8 ms 16988 KB Output is correct
8 Correct 8 ms 16220 KB Output is correct
9 Correct 3 ms 1116 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 8 ms 16476 KB Output is correct
12 Correct 1 ms 1368 KB Output is correct
13 Correct 33 ms 15372 KB Output is correct
14 Correct 24 ms 9812 KB Output is correct
15 Correct 19 ms 14420 KB Output is correct
16 Correct 14 ms 6492 KB Output is correct
17 Correct 88 ms 33140 KB Output is correct
18 Correct 59 ms 47932 KB Output is correct
19 Correct 54 ms 43092 KB Output is correct
20 Correct 47 ms 27388 KB Output is correct
21 Correct 99 ms 60912 KB Output is correct
22 Correct 111 ms 69276 KB Output is correct
23 Correct 160 ms 56264 KB Output is correct
24 Correct 90 ms 59352 KB Output is correct
25 Correct 377 ms 159056 KB Output is correct
26 Correct 305 ms 236024 KB Output is correct
27 Correct 444 ms 241232 KB Output is correct
28 Correct 548 ms 189140 KB Output is correct
29 Correct 530 ms 183360 KB Output is correct
30 Correct 504 ms 190908 KB Output is correct
31 Correct 434 ms 115528 KB Output is correct
32 Correct 379 ms 203260 KB Output is correct