Submission #1213782

#	Time	Username	Problem	Language	Result	Execution time	Memory
1213782		mychecksedad	Crossing (JOI21_crossing)	C++20	100 / 100	576 ms	24976 KiB

Main

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
#define ff first
#define ss second
#define pii pair<int,int>
#define vi vector<int>
#define cerr if(false) cerr
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;


int n, q, lazy[N];
string A, B, C, TT;
int id[500];
ll p[N], T[N], dp[4][N];

int get(int c, int len){
  return dp[c][len];
}

void build(int l, int r, int k){
  lazy[k] = 0;
  if(l == r){
    T[k] = id[TT[l - 1]];
    return;
  }
  int mid = l+r>>1;
  build(l, mid, k<<1);
  build(mid+1, r, k<<1|1);
  T[k] = (T[k<<1] + T[k<<1|1] * p[mid - l + 1]) % MOD;
}

void push(int k, int l, int r){
  if(lazy[k] != 0){
    int mid = l+r>>1;
    lazy[k<<1] = lazy[k];
    lazy[k<<1|1] = lazy[k];
    T[k<<1] = get(lazy[k], mid - l + 1);
    T[k<<1|1] = get(lazy[k], r - mid);
    lazy[k] = 0;
  } 
}

void upd(int l, int r, int ql, int qr, int k, int c){
  if(ql > r || l > qr) return;
  if(ql <= l && r <= qr){
    lazy[k] = c;
    T[k] = get(c, r - l + 1);
    return;
  }
  int mid = l+r>>1;
  push(k, l, r);
  upd(l, mid, ql, qr, k<<1, c);
  upd(mid+1, r, ql, qr, k<<1|1, c);
  T[k] = (T[k<<1] + T[k<<1|1] * p[mid - l + 1]) % MOD;
}

ll H(string &s){
  ll h = 0;
  for(int i = 1; i <= n; ++i){
    h = (h + (id[s[i-1]] * p[i-1])) % MOD;
  }
  return h;
}

string cross(string &x, string &y){
  string t;
  for(int i = 0; i < n; ++i){
    char other;
    if(x[i] != 'J' && y[i] != 'J') other = 'J';
    if(x[i] != 'O' && y[i] != 'O') other = 'O';
    if(x[i] != 'I' && y[i] != 'I') other = 'I';
    t += (x[i] == y[i] ? x[i] : other);
  }
  return t;
}

vector<string> SP;
map<int, bool> VIS;
void process(){
  for(int i = 1; i < SP.size(); ++i){
    for(int j = 0; j < i; ++j){
      string t = cross(SP[i], SP[j]);
      int h = H(t);
      if(VIS[h] == 0){
        VIS[h] = 1;
        SP.pb(t);
      }
    }
  }
  for(auto s: SP) cerr << s << '\n';
}

void solve(){
  cin >> n >> A >> B >> C >> q >> TT;
  id['J'] = 1;
  id['O'] = 2;
  id['I'] = 3;

  p[0] = 1;
  for(int i = 1; i <= n; ++i){
    p[i] = (p[i - 1] * 7) % MOD;
  }

  for(int j = 1; j <= 3; ++j){
    dp[j][0] = 0;
    for(int i = 1; i <= n; ++i){
      dp[j][i] = (dp[j][i - 1] + p[i-1] * j) % MOD;
    }
  }

  SP.pb(A);
  SP.pb(B);
  SP.pb(C);
  VIS[H(A)] = VIS[H(B)] = VIS[H(C)] = 1;
  process();


  build(1, n, 1);

  if(VIS[T[1]]) cout << "Yes\n";
  else cout << "No\n";

  for(int i = 1; i <= q; ++i){
    int l, r; char c; cin >> l >> r >> c;
    upd(1, n, l, r, 1, id[c]);

    if(VIS[T[1]]) cout << "Yes\n";
    else cout << "No\n";
  }
}


int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

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