Submission #501048

#	Time	Username	Problem	Language	Result	Execution time	Memory
501048		600Mihnea	Miners (IOI07_miners)	C++17	27 / 100	48 ms	500 KiB

miners

#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(0); cin.tie(0);

 /// freopen ("input", "r", stdin);

  int n;
  string s;
  cin >> n >> s;

  function<int(deque<int>)> eval = [&] (deque<int> d) {
    set<int> F;
    for (auto &x : d) {
      F.insert(x);
    }
    return (int) F.size();
  };

  function<int(deque<int>, int)> when = [&] (deque<int> d, int x) {
    while ((int) d.size() < 2) d.push_front(-1);
    assert((int) d.size() == 2);
    if (d[0] == x && d[1] == x) return 10;
    if (d[1] == x) return 2;
    if (d[0] == x) return 1;
    return -1;
  };

  int sol = 0;
  deque<int> a, b;

  for (int i = 1; i <= n; i++) {
    if ((int) a.size() == 3) a.pop_front();
    if ((int) b.size() == 3) b.pop_front();
    int x = s[i - 1];

    if (a.empty()) {a.push_back(x); sol += eval(a); continue;}
    if (b.empty()) {b.push_back(x); sol += eval(b); continue;}
    if ((int) a.size() == 1 && x != a[0]) {a.push_back(x); sol += eval(a); continue;}
    if ((int) b.size() == 1 && x != b[0]) {b.push_back(x); sol += eval(b); continue;}
    if (when(a, x) < when(b, x)) {
      a.push_back(x);
      sol += eval(a);
    } else {
      b.push_back(x);
      sol += eval(b);
    }
  }

  cout << sol << "\n";

  return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 0 / 9
• Subtask 3: 9 / 9
• Subtask 4: 0 / 9
• Subtask 5: 9 / 9
• Subtask 6: 0 / 7
• Subtask 7: 0 / 8
• Subtask 8: 0 / 8
• Subtask 9: 0 / 8
• Subtask 10: 0 / 8
• Subtask 11: 0 / 8
• Subtask 12: 0 / 8