제출 #636667

#제출 시각아이디문제언어결과실행 시간메모리
636667LKR__enjoyerTracks in the Snow (BOI13_tracks)C++17
100 / 100
1371 ms119748 KiB
#include<bits/stdc++.h> #include <iostream> using namespace std; #define f first #define s second int n,m; char grid[4000][4000]; int odl[4000][4000]; int wynik=1; pair<int,int> ruchy[4]={{1,0},{-1,0},{0,1},{0,-1}}; void bfs(int i,int j) { deque<pair<int,int>> w; w.push_front({i,j}); while(w.size()) { pair<int,int> akt=w.front(); w.pop_front(); wynik=max(wynik,odl[akt.f][akt.s]); for(int z=0;z<4;z++) { int u1=akt.f+ruchy[z].f; int u2=akt.s+ruchy[z].s; if(u1<0||u1>=n||u2<0||u2>=m||grid[u1][u2]=='.'||odl[u1][u2]!=0)continue; int waga=0; if(grid[akt.f][akt.s]!=grid[u1][u2])waga=1; odl[u1][u2]=odl[akt.f][akt.s]+waga; if(waga==1)w.push_back({u1,u2}); else w.push_front({u1,u2}); } } } int main() { ios_base::sync_with_stdio(); cin.tie(); cin>>n>>m; for(int i=0;i<n;i++) for(int j=0;j<m;j++) cin>>grid[i][j]; odl[0][0]=1; bfs(0,0); cout<<wynik; return 0; }
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