Submission #438498

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
438498	2021-06-28 06:05:53	zeyu	Tracks in the Snow (BOI13_tracks)	C++17	100 / 100	985 ms	110424 KiB

tracks

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#include <bits/stdc++.h>
using namespace std;
int dx[4] = {1, -1, 0, 0};
int dy[4] = {0, 0, 1, -1};
int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  char graph[n][m];
  for (int i = 0; i < n; i ++) for (int j = 0; j < m; j ++) cin >> graph[i][j];
  int cnt[n][m];
  int inf = 0x3f3f3f3f;
  memset(cnt, inf, sizeof(cnt));
  cnt[0][0] = 1;
  deque<pair<int, int> > que;
  que.push_front(make_pair(0, 0));
  while(! que.empty()){
    pair<int, int> p = que.front();
    que.pop_front();
    for (int i = 0; i < 4; i ++){
      int x = p.first + dx[i];
      int y = p.second + dy[i];
      if (x >= 0 && x < n && y >= 0 && y < m && cnt[x][y] > cnt[p.first][p.second] + (graph[x][y] != graph[p.first][p.second]) && (graph[x][y] == 'R' || graph[x][y] == 'F')){
        if (graph[x][y] != graph[p.first][p.second]){
          cnt[x][y] = cnt[p.first][p.second] + 1;
          que.push_back(make_pair(x, y));
        } else{
          cnt[x][y] = cnt[p.first][p.second];
 
 
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• Subtask 1: 30 / 30
• Subtask 2: 70 / 70