제출 #807482

#제출 시각아이디문제언어결과실행 시간메모리
807482gtm7Tracks in the Snow (BOI13_tracks)C++17
6.67 / 100
2095 ms454236 KiB
#include <bits/stdc++.h> using namespace std; int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); char a[4000][4000]; bool visited[4000][4000]{false}; const int dx[4] = {1, 0, -1, 0}; const int dy[4] = {0, 1, 0, -1}; int h, w; cin >> h >> w; char ch; for (int i = 0; i < h; i++) { for (int j = 0; j < w; j++) { cin >> a[i][j]; } } int ans = 1; set<vector<int>> q; vector<int> s; int ii, jj; q.insert({1, 0, 0}); visited[0][0] = true; while (!q.empty()) { s = *q.begin(); q.erase(q.begin()); for (int i = 0; i < 4; i++) { ii = s[1] + dx[i]; jj = s[2] + dy[i]; if (ii >= 0 && ii < h && jj >= 0 && jj < w && !visited[ii][jj] && a[ii][jj] != 3) { visited[ii][jj] = true; if (a[ii][jj] == a[s[1]][s[2]]) { q.insert({s[0], ii, jj}); } else { ans = max(ans, s[0] + 1); q.insert({s[0] + 1, ii, jj}); } } } } cout << ans << "\n"; }

컴파일 시 표준 에러 (stderr) 메시지

tracks.cpp: In function 'int main()':
tracks.cpp:14:10: warning: unused variable 'ch' [-Wunused-variable]
   14 |     char ch;
      |          ^~
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