Submission #813635

#	Time	Username	Problem	Language	Result	Execution time	Memory
813635		Cookie	Crossing (JOI21_crossing)	C++14	0 / 100	62 ms	880 KiB

Main

#include<bits/stdc++.h>
#include<fstream>
using namespace std;
ifstream fin("VNOICUP.INP");
ofstream fout("VNOICUP.OUT");
#define sz(a) (int)a.size()
#define ll long long
#define pb push_back
#define forr(i, a, b) for(int i = a; i < b; i++)
#define dorr(i, a, b) for(int i = a; i >= b; i--)
#define ld long double
#define vt vector
#include<fstream>
#define fi first
#define se second
#define pll pair<ll, ll>
#define pii pair<int, int>
const ld PI = 3.14159265359;
using u128 = __uint128_t;
//const int x[4] = {1, -1, 0, 0};
//const int y[4] = {0, 0, 1, -1};
ll mod = 1e9 + 9;
const int mxn = 2e5 + 5, mxq = 2e5 + 5, sq = 400, mxv = 2e5 + 5;
//const int base = (1 << 18);
const int inf = 1e9, neg = -69420;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll rr(ll l, ll r){
    return(uniform_int_distribution<ll>(l, r)(rng));
}

map<ll, int>mp;
int to[mxn + 1];
ll st[4 * mxn + 1], lz[4 * mxn + 1];
ll pw[mxn + 1], pref[mxn + 1], n, q;
string s[3], t;
string conv(string a, string b){
    string res = "";
    for(int i = 0; i < sz(a); i++){
        if(a[i] == b[i])res += a[i];
        else if(a[i] == 'J'){
            if(b[i] = 'O')res += 'I';
            else res += 'O';
        }else if(a[i] == 'O'){
            if(b[i] == 'J')res += 'I';
            else res += 'J';
        }else{
            if(b[i] == 'O')res += 'J';
            else res += 'O';
        }
    }
    return(res);
}
ll gethash(string s){
    ll ans = 0;
    for(int i = 0; i < sz(s); i++){
        ans += pw[sz(s) - i - 1] * to[s[i]];
        ans %= mod;
    }
    return(ans);
}
void build(int nd, int l, int r){
    if(l == r){
        st[nd] = to[t[l]];
        return;
    }
    int mid = (l + r) >> 1;
    build(nd << 1, l, mid); build(nd << 1 | 1, mid + 1, r);
    st[nd] = (st[nd << 1] * pw[r - mid] + st[nd << 1 | 1]) % mod;
    //cout << l << " " << r << " " << st[nd] << "\n";

}
void push(int nd, int l, int mid, int r){
    if(lz[nd] == -1)return;
    ll x = lz[nd];
    lz[nd << 1] = lz[nd]; lz[nd << 1 | 1] = lz[nd];
    st[nd << 1] = (pref[mid - l] * x) % mod;
    st[nd << 1 | 1] = (pref[r - (mid + 1)] * x) % mod;
    lz[nd] = -1;
    return;
}
void upd(int nd, int l, int r, int ql, int qr, int x){
    if(ql > r || qr < l)return;
    if(ql <= l && qr >= r){
        lz[nd] = x;
        st[nd] = (pref[r - l] * x) % mod;
        return;
    }
    int mid = (l + r) >> 1;
    push(nd, l, mid, r);
    upd(nd << 1, l, mid, ql, qr, x); upd(nd << 1 | 1, mid + 1, r, ql, qr, x);
    st[nd] = (st[nd << 1] * pw[r - mid] + st[nd << 1 | 1]) % mod;
}
signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n;
    mod = rr(1e9, 1e15);
    pw[0] = 1;
    for(int i = 1; i <= n; i++){
        pw[i] = (pw[i - 1] * 3) % mod;
    }
    pref[0] = pw[0];
    for(int i = 1; i <= n; i++){
        pref[i] = (pref[i - 1] + pw[i]) % mod;
    }
  for(int i = 1; i <= 4 * n; i++)lz[i] = -1;
    to['J'] = 0; to['O'] = 1; to['I'] = 2;
    cin >> s[0] >> s[1] >> s[2];
    for(int i = 0; i < 3; i++){
        for(int j = 0; j < 3; j++){
            for(int k = 0; k < 3; k++){
                mp[gethash(conv(conv(s[i], s[j]), s[k]))] = 1;
            }
        }
    }


    cin >> q;
    cin >> t;
    build(1, 0, n - 1);
    ll ht = st[1];
    
    if(mp.find(ht) != mp.end()){
        cout << "Yes";
    }else{
        cout << "No";
    }
    cout << "\n";

    while(q--){
        int l, r; char c; cin >> l >> r >> c; l--; r--;
        upd(1, 0, n - 1, l, r, to[c]);
        ll ht = st[1];
        
        if(mp.find(ht) != mp.end()){
            cout << "Yes";
        }else{
            cout << "No";
        }
        cout << "\n";
    }

}

Compilation message (stderr)

Main.cpp: In function 'std::string conv(std::string, std::string)':
Main.cpp:42:21: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   42 |             if(b[i] = 'O')res += 'I';
Main.cpp: In function 'long long int gethash(std::string)':
Main.cpp:57:43: warning: array subscript has type 'char' [-Wchar-subscripts]
   57 |         ans += pw[sz(s) - i - 1] * to[s[i]];
      |                                           ^
Main.cpp: In function 'void build(int, int, int)':
Main.cpp:64:25: warning: array subscript has type 'char' [-Wchar-subscripts]
   64 |         st[nd] = to[t[l]];
      |                         ^
Main.cpp: In function 'int main()':
Main.cpp:132:35: warning: array subscript has type 'char' [-Wchar-subscripts]
  132 |         upd(1, 0, n - 1, l, r, to[c]);
      |                                   ^

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