Submission #552058

#	Time	Username	Problem	Language	Result	Execution time	Memory
552058		Soul234	JJOOII 2 (JOI20_ho_t2)	C++14	100 / 100	18 ms	2012 KiB

ho_t2

#include<bits/stdc++.h>
using namespace std;

void DBG() { cerr << "]\n"; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << h; if(sizeof...(t)) cerr << ", ";
    DBG(t...);
}
#ifdef LOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif // LOCAL

#define FOR(i,a,b) for(int i = (a) ; i<(b) ; i++)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for(int i = (b)-1 ; i>=(a) ; i--)
#define R0F(i,a) ROF(i,0,a)
#define each(e,a) for(auto &e : (a))
#define sz(v) (int)(v).size()
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pb push_back
#define tcT template<class T
#define nl "\n"

using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using str = string;
tcT> using V = vector<T>;
tcT> using pqg = priority_queue<T,vector<T>,greater<T>>;

void setIO(string NAME = "") {
    cin.tie(0)->sync_with_stdio(0);
    if(sz(NAME)) {
        freopen((NAME + ".inp").c_str(),"r",stdin);
        freopen((NAME + ".out").c_str(),"w",stdout);
    }
}

const int MOD = 1e9 + 7;

tcT> bool ckmin(T&a, const T&b) {
    return b < a ? a = b, 1 : 0;
}

int N, K;
str S;
vi pos[26];

void solve() {
    cin>>N>>K>>S;
    int ans = MOD;
    F0R(i,N) pos[S[i]-'A'].pb(i);
    F0R(i,N) if(S[i] == 'J') {
        int j = i-1;
        int lst = -1;
        for(char c : {'J', 'O', 'I'}) {
            int idx = upper_bound(all(pos[c-'A']), j) - begin(pos[c-'A']);
            idx += K-1;
            if(idx>=sz(pos[c-'A'])) break;
            j = pos[c-'A'][idx];
            if(c == 'I') lst = j;
        }
        if(~lst) ckmin(ans, lst-i+1-K*3);
    }
    cout << (ans == MOD ? -1 : ans) << nl;
}

int main() {
    setIO();

    int t=1;
    //cin>>t;
    while(t-->0) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'void setIO(std::string)':
ho_t2.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen((NAME + ".inp").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ho_t2.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen((NAME + ".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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