Submission #985257

#	Time	Username	Problem	Language	Result	Execution time	Memory
985257		underwaterkillerwhale	Crossing (JOI21_crossing)	C++17	3 / 100	7009 ms	73000 KiB

Main

#include <bits/stdc++.h>
#define se              second
#define fs              first
#define mp              make_pair
#define pb              push_back
#define ll              long long
#define ii              pair<ll,ll>
#define ld              long double
#define SZ(v)           (int)v.size()
#define ALL(v)          v.begin(), v.end()
#define bit(msk, i)     ((msk >> i) & 1)
#define iter(id, v)     for(auto id : v)
#define rep(i,m,n)      for(int i=(m); i<=(n); i++)
#define reb(i,m,n)      for(int i=(m); i>=(n); i--)
using namespace std;

mt19937_64 rd(chrono :: steady_clock :: now().time_since_epoch().count());
ll Rand(ll l, ll r) { return uniform_int_distribution<ll> (l, r)(rd); }

const int N = 1e6 + 7;
const ll Mod = 1e9 + 7;
const int szBL = 916;
const ll INF = 1e9;
const int BASE = 137;

int n, Q;
ll pw[N], hs[30][N];

void initHS () {
    pw[0] = 1;
    rep (i, 1, n * 2) pw[i] = pw[i - 1] * BASE;
    rep (i, 0, 29) hs[i][0] = 1;
    vector<char> c = {'J', 'O', 'I'};
    rep (i, 1, n)
    iter (id, c)
        hs[id - 'A'][i] = (hs[id - 'A'][i - 1] * BASE % Mod + id - 'A') % Mod;
}

ll getHS (string S) {
    ll res = 0;
    rep (i, 1, n) res = (res * BASE % Mod + S[i - 1]  - 'A') % Mod;
    return res;
}

void solution () {
    cin >> n;
    string A, B, C;
    cin >> A >> B >> C;

    auto Merge = [&] (string A, string B) {
        static string res;
        res.resize(SZ(A));
        rep (i, 0, SZ(A) - 1)
            if (A[i] == B[i]) res[i] = A[i];
            else {
                static set<char> c;
                c = {'J', 'O', 'I'};
                c.erase(A[i]);
                c.erase(B[i]);
                res[i] = *c.begin();
            }
        return res;
    };
    set<string> S = {A, B, C};
    int prevsz = SZ(S);
    while (1) {
        static set<string> newStr;
        newStr.clear();
        iter (&id1, S)
        iter( &id2, S) newStr.insert(Merge(id1, id2));
        iter (&id, newStr) S.insert(id);
        if (SZ(S) == prevsz) break;
        else prevsz = SZ(S);
    }
    set<ll> vecHS;
    initHS();
    iter (&id, S) vecHS.insert(getHS(id));

    cin >> Q;
    string T; cin >> T;
    if (vecHS.find(getHS(T)) != vecHS.end()) cout <<"Yes\n";
    else cout <<"No\n";
    rep (i, 1, Q) {
        int L, R;
        char C;
        cin >> L >> R >> C;
        rep (i, L - 1, R - 1) T[i] = C;
        if (vecHS.find(getHS(T)) != vecHS.end()) cout <<"Yes\n";
        else cout <<"No\n";
    }

}

#define file(name) freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);

int main () {
//    file("c");
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    ll num_Test = 1;
//    cin >> num_Test;
    while(num_Test--)
        solution();
}
/*
18 3
2 5
6 21
13 19
9 17
14 17
19 20
2 16
2 10
9 14
19 20
14 16
1 3
17 19
14 21
18 19
4 7
5 12
1 13

*/

• Subtask 1: 3 / 3
• Subtask 2: 0 / 23
• Subtask 3: 0 / 23
• Subtask 4: 0 / 51