제출 #862289

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
862289	2023-10-18 01:59:55	blackslex	Tracks in the Snow (BOI13_tracks)	C++17	100 / 100	406 ms	133296 KiB

tracks

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#include<bits/stdc++.h>
 
using namespace std;
using pii = pair<int, int>;
 
const int N = 4005, cd[4][2] = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
int n, m, d[N][N], mx = 1;
char c[N][N];
deque<pii> q;
 
int main() {
  scanf("%d %d", &n, &m);
  for (int i = 0; i < n; i++) scanf("%s", c[i]);
  d[0][0] = 1;
  q.emplace_back(0, 0);
  while (!q.empty()) {
    int x, y;
    tie(x, y) = q.front();
    q.pop_front();
    mx = max(mx, d[x][y]);
    for (int i = 0; i < 4; i++) {
      int nx = x + cd[i][0], ny = y + cd[i][1];
      if (nx < 0 || nx >= n || ny < 0 || ny >= m || c[nx][ny] == '.' || d[nx][ny]) continue;
      if (c[nx][ny] == c[x][y]) d[nx][ny] = d[x][y], q.emplace_front(nx, ny);
      else d[nx][ny] = d[x][y] + 1, q.emplace_back(nx, ny);
    }
  }
  printf("%d", mx);
}
 
 
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컴파일 시 표준 에러 (stderr) 메시지

tracks.cpp: In function 'int main()':
tracks.cpp:12:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  scanf("%d %d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~
tracks.cpp:13:35: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  for (int i = 0; i < n; i++) scanf("%s", c[i]);
      |                              ~~~~~^~~~~~~~~~~~

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