Submission #798972

#	Time	Username	Problem	Language	Result	Execution time	Memory
798972		arush_agu	JJOOII 2 (JOI20_ho_t2)	C++17	100 / 100	33 ms	7244 KiB

ho_t2

#include <algorithm>
#include <cctype>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

#ifdef DEBUG
#include <time.h>
#endif

#define all(a) (a).begin(), (a).end()
#define rev(a) (a).rbegin(), (a).rend()
#define F first
#define S second
int recur_depth = 0;
#ifdef DEBUG
#define dbg(x)                                                                 \
  {                                                                            \
    ++recur_depth;                                                             \
    auto x_ = x;                                                               \
    --recur_depth;                                                             \
    cerr << string(recur_depth, '\t') << "\e[91m" << __func__ << ":"           \
         << __LINE__ << "\t" << #x << " = " << x_ << "\e[39m" << endl;         \
  }
#else
#define dbg(x)
#endif

using namespace std;
using namespace __gnu_pbds;

typedef pair<int, int> ii;

typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> llll;

typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pair<int, int>> vii;
typedef vector<vii> vvii;

typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<pair<ll, ll>> vll;
typedef vector<vll> vvll;

typedef vector<bool> vb;

template <class type1>
using ordered_set = tree<type1, null_type, less<type1>, rb_tree_tag,
                         tree_order_statistics_node_update>;

template <typename A, typename B>
ostream &operator<<(ostream &os, const pair<A, B> &p) {
  return os << '(' << p.first << ", " << p.second << ')';
}
template <typename T_container, typename T = typename enable_if<
                                    !is_same<T_container, string>::value,
                                    typename T_container::value_type>::type>
ostream &operator<<(ostream &os, const T_container &v) {
  os << '{';
  string sep;
  for (const T &x : v)
    os << sep << x, sep = ", ";
  return os << '}';
}

const ll MOD = 1e9 + 7;
// const ll MOD = 998244353;
const ll INF = 1e18;
const ld EPS = 1e-9;

void solve() {
  int n, k;
  cin >> n >> k;
  string s;
  cin >> s;

  auto cid = [](char c) {
    if (c == 'J')
      return 0;
    if (c == 'O')
      return 1;
    return 2;
  };

  while (!s.empty() && s.back() != 'I')
    s.pop_back();
  reverse(all(s));
  while (!s.empty() && s.back() != 'J')
    s.pop_back();
  reverse(all(s));

  n = s.size();

  vvl pr(3, vl(n + 1));

  for (int i = 1; i <= n; i++) {
    int v = cid(s[i - 1]);
    pr[v][i]++;
    for (int j = 0; j < 3; j++)
      pr[j][i] += pr[j][i - 1];
  }

  ll ans = INF;
  for (int i = 1; i <= n; i++) {
    ll l = 1, r = i, lefO = -1;
    while (l <= r) {
      int m = (l + r) / 2;
      if (pr[1][i] - pr[1][m - 1] >= k)
        lefO = m, l = m + 1;
      else
        r = m - 1;
    }
    if (lefO == -1)
      continue;
    l = 1, r = lefO - 1;
    ll lefJ = -1;
    while (l <= r) {
      int m = (l + r) / 2;
      if (pr[0][lefO - 1] - pr[0][m - 1] >= k)
        lefJ = m, l = m + 1;
      else
        r = m - 1;
    }
    if (lefJ == -1)
      continue;
    l = i + 1, r = n;
    ll rigI = -1;
    while (l <= r) {
      int m = (l + r) / 2;
      if (pr[2][m] - pr[2][i] >= k)
        rigI = m, r = m - 1;
      else
        l = m + 1;
    }
    if (rigI == -1)
      continue;
    ans = min(ans, rigI - lefJ + 1 - 3 * k);
  }
  cout << (ans >= INF ? -1 : ans) << '\n';
}

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

  clock_t start = clock();

  int test_cases = 1;
  // cin >> test_cases;

  while (test_cases--)
    solve();

#ifdef DEBUG
  cerr << fixed << setprecision(10)
       << "\nTime Taken: " << (double)(clock() - start) / CLOCKS_PER_SEC
       << "s\n";
#endif
  return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:167:11: warning: unused variable 'start' [-Wunused-variable]
  167 |   clock_t start = clock();
      |           ^~~~~

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