제출 #1128953

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1128953		rcll	Tracks in the Snow (BOI13_tracks)	C++20	100 / 100	700 ms	119872 KiB

tracks

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

int directions_x[4]{1,-1,0,0};
int directions_y[4]{0,0,1,-1};
int n,m,depth[4000][4000],ans=1;
string snow[4000];

bool inside(int x,int y) {
	return (x>-1 && x<n && y>-1 && y<m && snow[x][y]!='.');
}

int main() {
    cin >> n >> m;
	for (int i=0; i<n; i++) {
        cin >> snow[i];
    }
	deque<pair<int,int>> q;
	q.push_back({0,0});
	depth[0][0]=1;
	while (q.size()) {
		pair<int,int> c=q.front();
		q.pop_front();
		ans=max(ans,depth[c.first][c.second]);
		for (int i=0; i<4; i++) {
			int x=c.first+directions_x[i],y=c.second+directions_y[i];
			if (inside(x,y) && depth[x][y]==0) {
				if (snow[x][y]==snow[c.first][c.second]) {
					depth[x][y]=depth[c.first][c.second];
					q.push_front({x,y});
				} else {
					depth[x][y]=depth[c.first][c.second] + 1;
					q.push_back({x,y});
				}
			}
		}
	}
	cout << ans;
}

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