Submission #626789

#	Time	Username	Problem	Language	Result	Execution time	Memory
626789		MilosMilutinovic	Jetpack (COCI16_jetpack)	C++14	80 / 80	31 ms	14404 KiB

jetpack

/**
 *    author:  wxhtzdy
 *    created: 11.08.2022 20:41:13
**/
#include <bits/stdc++.h>

using namespace std;

string to_string(string s) {
  return '"' + s + '"';
}
string to_string(const char* s) {
  return to_string((string) s);
}
string to_string(bool b) {
  return (b ? "true" : "false");
}
template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}
template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto &x : v) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}
#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);  
  int n;
  cin >> n;
  vector<string> s(10);
  for (int i = 0; i < 10; i++) {
    cin >> s[i];
  }                 
  vector<vector<bool>> was(10, vector<bool>(n));
  vector<vector<pair<int, int>>> prv(10, vector<pair<int, int>>(n));
  vector<pair<int, int>> que;        
  for (int i = 0; i < 10; i++) {
    for (int j = 0; j < n; j++) {
      if (j == n - 1 && s[i][j] == '.') {
        was[i][j] = true;
        que.emplace_back(i, j);
      }
    }
  }
  for (int b = 0; b < (int) que.size(); b++) {
    int x = que[b].first;
    int y = que[b].second;
    if (x > 0 && y > 0 && !was[x - 1][y - 1] && s[x - 1][y - 1] == '.') {
      was[x - 1][y - 1] = true;
      prv[x - 1][y - 1] = make_pair(x, y);
      que.emplace_back(x - 1, y - 1);
    }
    if (x < 9 && y > 0 && !was[x + 1][y - 1] && s[x + 1][y - 1] == '.') {
      was[x + 1][y - 1] = true;
      prv[x + 1][y - 1] = make_pair(x, y);
      que.emplace_back(x + 1, y - 1);
    }
    if (x == 9 && y > 0 && !was[x][y - 1] && s[x][y - 1] == '.') {
      was[x][y - 1] = true;
      prv[x][y - 1] = make_pair(x, y);
      que.emplace_back(x, y - 1);  
    }
    if (x == 0 && y > 0 && !was[x][y - 1] && s[x][y - 1] == '.') {
      was[x][y - 1] = true;
      prv[x][y - 1] = make_pair(x, y);
      que.emplace_back(x, y - 1);  
    }
  }
  if (n == 1) {
    cout << 0 << '\n';
    return 0;
  }
  vector<pair<int, int>> cells;
  int x = 9, y = 0;
  while (y < n - 1) {
    cells.emplace_back(x, y);
    auto p = prv[x][y];
    x = p.first;
    y = p.second;
  }
  vector<pair<int, int>> ans;
  for (int i = 0; i < (int) cells.size() - 1; i++) {
    if (cells[i].first > cells[i + 1].first || (cells[i].first == cells[i + 1].first && cells[i].first == 0)) {
      ans.emplace_back(cells[i].second, 1);
    }
  }
  vector<pair<int, int>> nans;
  for (int i = 0; i < (int) ans.size(); i++) {
    int ptr = i;
    while (ptr + 1 < (int) ans.size() && ans[ptr + 1].first == ans[ptr].first + 1) {
      ptr += 1; 
    }
    nans.emplace_back(ans[i].first, ptr - i + 1);
    i = ptr;
  }
  //swap(ans, nans);
  cout << (int) ans.size() << '\n';
  for (int i = 0; i < (int) ans.size(); i++) {
    cout << ans[i].first << " " << ans[i].second << '\n';
  }                   
  return 0;
}

• Subtask 1: 80 / 80