Submission #710965

#	Time	Username	Problem	Language	Result	Execution time	Memory
710965		zeta7532	Crossing (JOI21_crossing)	C++17	0 / 100	373 ms	828 KiB

Main

#include <bits/stdc++.h>
#pragma GCC target ("avx2")
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
using namespace std;
using ll = int;
const ll mod = 998244353;
#define fi first
#define se second
#define all(x) x.begin(),x.end()
#define rep(i,x) for(ll i=0;i<x;i++)
#define faster ios::sync_with_stdio(false);cin.tie(nullptr)

int main(){
    ll N;
    cin >> N;
    if(N>100) return 0;
    vector<ll> rui(N);
    rui[0]=1;
    rep(i,N-1) rui[i+1]=(rui[i]*3)%mod;
    vector<vector<ll>> S(N,vector<ll>(3));
    rep(i,3){
        rep(j,N){
            char c;
            cin >> c;
            if(c=='J') S[j][i]=0;
            if(c=='O') S[j][i]=1;
            if(c=='I') S[j][i]=2;
        }
    }
    set<ll> ans;
    rep(i,27){
        if(i==0) continue;
        vector<ll> cnt(N,0);
        ll i0=i%3;
        ll i1=(i%9)/3;
        ll i2=i/9;
        rep(j,N) cnt[j]+=S[j][0]*i0;
        rep(j,N) cnt[j]+=S[j][1]*i1;
        rep(j,N) cnt[j]+=S[j][2]*i2;
        rep(j,N) cnt[j]%=3;
        ll ANS=0;
        rep(j,N) ANS=(ANS+cnt[j]*rui[j])%mod;
        ans.insert(ANS);
    }
    ll Q;
    cin >> Q;
    vector<ll> T(N);
    rep(i,N){
        char c;
        cin >> c;
        if(c=='J') T[i]=0;
        if(c=='O') T[i]=1;
        if(c=='I') T[i]=2;
    }
    rep(i,Q+1){
        ll x=0;
        rep(j,N) x=(x+T[j]*rui[j])%mod;
        if(ans.find(x)!=ans.end()){
            cout << "Yes" << '\n';
        }    
        else cout << "No" << '\n';
        if(i==Q) break;
        ll l,r;
        char c;
        cin >> l >> r >> c;
        l--,r--;
        ll C=-1;
        if(c=='J') C=0;
        if(c=='O') C=1;
        if(c=='I') C=2;
        for(ll j=l;j<=r;j++){
            T[j]=C; 
        }
    }
}

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