제출 #1228358

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1228358		ffeyyaae_	Tracks in the Snow (BOI13_tracks)	C++20	100 / 100	484 ms	118840 KiB

tracks

#include <bits/stdc++.h>

using namespace std;

using pii = pair<int,int>;

const int N = 4005;

string a[N];
int h, w, dp[N][N];
int diry[] = {0, 1, 0, -1}, dirx[] = {1, 0, -1, 0};

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> h >> w;
    for( int i=0;i<h;i++ )
    {
        cin >> a[i];
    }
    int ans = 0;
    deque<pii> q;
    q.push_back( {0, 0} );
    dp[0][0] = 1;
    while( !q.empty() )
    {
        auto [r, c] = q.front();
        q.pop_front();
        ans = max( ans, dp[r][c] );
        for( int i=0;i<4;i++ )
        {
            int nr = r+diry[i], nc = c+dirx[i];
            if( nr>=h || nc>=w || nr<0 || nc<0 || a[nr][nc] == '.' ) continue;
            if( dp[nr][nc] ) continue;
            if( a[r][c] == a[nr][nc] )
            {
                dp[nr][nc] = dp[r][c];
                q.push_front( {nr, nc} );
            } 
            else
            {
                dp[nr][nc] = dp[r][c]+1;
                q.push_back( {nr, nc} );
            } 
        }
    }
    cout << ans << "\n";
}

• Subtask 1: 30 / 30
• Subtask 2: 70 / 70