Submission #1109370

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1109370	2024-11-06 15:07:40	classic	Tracks in the Snow (BOI13_tracks)	C++17	100 / 100	464 ms	111960 KiB

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#include <bits/stdc++.h>
const std::vector<int> directionX{-1, 1, 0, 0};
const std::vector<int> directionY{0, 0, -1, 1};
int main() {
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);
  int numRow, numColumn;
  std::cin >> numRow >> numColumn;
  std::vector<std::string> snow(numRow);
  for (int row = 0; row < numRow; row++) {
    std::cin >> snow[row];
  }
  std::deque<std::pair<int, int>> deque;
  std::vector<std::vector<int>> depth(numRow, std::vector<int>(numColumn));
  deque.emplace_back(0, 0);
  depth[0][0] = 1;
  int result = 1;
  while (!deque.empty()) {
    auto [currentRow, currentColumn] = deque.front();
    deque.pop_front();
    result = std::max(result, depth[currentRow][currentColumn]);
    for (int direction = 0; direction < 4; direction++) {
      int nextRow = currentRow + directionX[direction];
      int nextColumn = currentColumn + directionY[direction];
      if (nextRow >= 0 && nextRow < numRow && nextColumn >= 0 && nextColumn < numColumn && 
        snow[nextRow][nextColumn] != '.' && depth[nextRow][nextColumn] == 0) {
        if (snow[currentRow][currentColumn] == snow[nextRow][nextColumn]) {
          depth[nextRow][nextColumn] = depth[currentRow][currentColumn];
 
 
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• Subtask 1: 30 / 30
• Subtask 2: 70 / 70