Submission #889910

#	Time	Username	Problem	Language	Result	Execution time	Memory
889910		avighna	JJOOII 2 (JOI20_ho_t2)	C++17	0 / 100	1 ms	348 KiB

ho_t2

#include <bits/stdc++.h>

using namespace std;

#define ll long long

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  ll n, k;
  string s;
  cin >> n >> k >> s;

  string target = string(k, 'J') + string(k, 'O') + string(k, 'I');
  ll ptr = 0;
  ll mn = LLONG_MAX, mx = LLONG_MIN;
  for (ll i = 0; i < n && ptr < target.length(); ++i) {
    if (s[i] == target[ptr]) {
      mn = min(mn, i);
      mx = max(mx, i);
      ptr++;
    }
  }

  if (ptr != target.length()) {
    cout << "-1\n";
    return 0;
  }

  ptr--;
  for (ll i = mx; i >= 0 && ptr >= 0; --i) {
    if (s[i] == target[ptr]) {
      mn = min(mn, i);
      mx = max(mx, i);
      ptr--;
    }
  }

  cout << mx - mn + 1 - 3 * k << "\n";
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:18:31: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |   for (ll i = 0; i < n && ptr < target.length(); ++i) {
      |                           ~~~~^~~~~~~~~~~~~~~~~
ho_t2.cpp:26:11: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |   if (ptr != target.length()) {
      |       ~~~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 1
• Subtask 2: 0 / 12
• Subtask 3: 0 / 87