Submission #645314

#	Time	Username	Problem	Language	Result	Execution time	Memory
645314		Hacv16	Zoo (COCI19_zoo)	C++17	110 / 110	50 ms	6288 KiB

zoo

#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

const int MAX = 1015;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9 + 7;

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

#define pb push_back
#define sz(x) (int) x.size()
#define fr first
#define sc second
#define mp make_pair
#define all(x) x.begin(), x.end()
#define dbg(x) cerr << #x << ": " << "[ " << x << " ]\n"

int n, m, ans, d[MAX][MAX];
char t[MAX][MAX];

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); 

    cin >> n >> m;

    memset(t, '*', sizeof(t));

    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= m; j++)
            cin >> t[i][j];
    
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= m; j++)
            d[i][j] = INF;

    deque<pair<int, pii>> q;
    q.push_front({1, {1, 1}});

    d[1][1] = 1;

    while(q.size()){
        int x = q.front().sc.fr, y = q.front().sc.sc;
        q.pop_front();

        for(int i = 0; i < 4; i++){
            int nx = x + dx[i], ny = y + dy[i];

            if(t[nx][ny] == '*') continue;

            int w = (t[x][y] == t[nx][ny] ? 0 : 1);

            if(d[nx][ny] > d[x][y] + w){
                d[nx][ny] = d[x][y] + w;

                if(w == 0) q.push_front({d[nx][ny], {nx, ny}});
                else q.push_back({d[nx][ny], {nx, ny}});
            }
        }
    }

    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            if(d[i][j] == INF) continue;
            ans = max(ans, d[i][j]);
        }
    }

    cout << ans << '\n';

    return 0;
}

• Subtask 1: 45 / 45
• Subtask 2: 65 / 65