제출 #1097106

#제출 시각아이디문제언어결과실행 시간메모리
1097106TrinhKhanhDungJJOOII 2 (JOI20_ho_t2)C++14
100 / 100
6 ms2424 KiB
#include <bits/stdc++.h> #define ll long long #define fi first #define se second #define sz(x) (int)x.size() #define ALL(v) v.begin(),v.end() #define MASK(k) (1LL << (k)) #define BIT(x, i) (((x) >> (i)) & 1) #define oo (ll)1e18 + 10 #define INF (ll)1e9 #define MOD (ll)(998244353) using namespace std; template<class T1, class T2> bool maximize(T1 &a, T2 b){if(a < b){a = b; return true;} return false;} template<class T1, class T2> bool minimize(T1 &a, T2 b){if(a > b){a = b; return true;} return false;} template<class T1, class T2> void add(T1 &a, T2 b){a += b; if(a >= MOD) a -= MOD;} template<class T1, class T2> void sub(T1 &a, T2 b){a -= b; if(a < 0) a += MOD;} template<class T> void cps(T &v){sort(ALL(v)); v.resize(unique(ALL(v)) - v.begin());} const int MAX = 2e5 + 10; int N, K; string s; int prefix[MAX], suffix[MAX]; void solve(){ cin >> N >> K >> s; s = "*" + s + "*"; int j = 0, cnt = 0; for(int i = 1; i <= N; i++){ cnt += (s[i] == 'J'); while(cnt > K || (cnt == K && s[j] != 'J')){ cnt -= (s[j] == 'J'); j++; } if(cnt == K) prefix[i] = j; } j = N + 1; cnt = 0; for(int i = N; i >= 1; i--){ cnt += (s[i] == 'I'); while(cnt > K || (cnt == K && s[j] != 'I')){ cnt -= (s[j] == 'I'); j--; } if(cnt == K) suffix[i] = j; } j = cnt = 0; int ans = INF; for(int i = 1; i < N; i++){ cnt += (s[i] == 'O'); while(cnt > K || (cnt == K && s[j] != 'O')){ cnt -= (s[j] == 'O'); j++; } if(cnt == K && prefix[j - 1] != 0 && suffix[i + 1] != 0){ minimize(ans, suffix[i + 1] - prefix[j - 1] + 1 - 3 * K); } } cout << (ans >= INF ? -1 : ans) << '\n'; } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); // freopen("task.inp","r",stdin); // freopen("task.out","w",stdout); int T = 1; // cin >> T; for(; T; T--) solve(); return 0; }
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