Submission #966775

#	Time	Username	Problem	Language	Result	Execution time	Memory
966775		kilkuwu	Street Lamps (APIO19_street_lamps)	C++17	20 / 100	5059 ms	524288 KiB

street_lamps

#include <bits/stdc++.h>

#define nl '\n'

#ifdef LOCAL
#include "template/debug.hpp"
#else
#define dbg(...) ;
#define timer(...) ;
#endif

signed main() {
  std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  int n, q;
  std::cin >> n >> q;
  std::vector<std::string> state(q + 1);
  std::cin >> state[0];
  std::vector<std::vector<int>> pref(q + 1);
  auto make_pref = [&](int id) {
    pref[id].resize(n + 1);
    pref[id][0] = 0;
    for (int i = 0; i < n; i++) {
      pref[id][i + 1] = pref[id][i] + (state[id][i] == '1');
    }
  };
  make_pref(0);

  for (int tt = 1; tt <= q; tt++) {
    std::string com;
    std::cin >> com;
    state[tt] = state[tt - 1];
    if (com == "toggle") {
      int i;
      std::cin >> i;
      --i;
      state[tt][i] = '1' ^ '0' ^ state[tt][i]; 
      make_pref(tt);
    } else {
      make_pref(tt);
      int a, b;
      std::cin >> a >> b;
      --a, --b;
      int ans = 0;
      for (int x = 0; x < tt; x++) {
        ans += pref[x][b] - pref[x][a] == b - a; 
      }
      std::cout << ans << nl;
    }
  }
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20