제출 #916175

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
916175		12345678	Crossing (JOI21_crossing)	C++17	100 / 100	262 ms	33516 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define ll long long

mt19937 rng(time(NULL));

const int nx=2e5+5, mod=1e9+7, base=(rng()%mod+mod)%mod;
ll n, mp[100], q, k[10], l, r;
char ch;
vector<ll> d[10], p(nx), qsp(nx);
string s[3], t;

struct segtree
{
    ll d[4*nx], lz[4*nx];
    void pushlz(int l, int r, int i)
    {
        if (lz[i]==-1) return;
        if (l==r) return d[i]=(((qsp[r]-qsp[l-1])*lz[i])%mod+mod)%mod, lz[i]=-1, void();
        d[i]=(((qsp[r]-qsp[l-1])*lz[i])%mod+mod)%mod;
        lz[2*i]=lz[i];
        lz[2*i+1]=lz[i];
        lz[i]=-1;
    }
    void build(int l, int r, int i)
    {
        lz[i]=-1;
        if (l==r) return lz[i]=mp[(int)t[l-1]], pushlz(l, r, i);
        int md=(l+r)/2;
        build(l, md, 2*i);
        build(md+1, r, 2*i+1);
        d[i]=(d[2*i]+d[2*i+1])%mod;
    }
    void update(int l, int r, int i, int ql, int qr, int vl)
    {
        pushlz(l, r, i);
        if (qr<l||r<ql) return;
        if (ql<=l&&r<=qr) return lz[i]=vl, pushlz(l, r, i), void();
        int md=(l+r)/2;
        update(l, md, 2*i, ql, qr, vl);
        update(md+1, r, 2*i+1, ql, qr, vl);
        d[i]=(d[2*i]+d[2*i+1])%mod;
    }
    bool check()
    {
        for (int i=0; i<9; i++) if (k[i]==d[1]) return 1;
        return 0;
    }
} st;

ll getval(vector<ll> &str)
{
    ll res=0;
    for (int i=1; i<=n; i++) res=(res+p[i]*str[i])%mod;
    return res;
}

vector<ll> cross(vector<ll> &lhs, vector<ll> &rhs)
{
    vector<ll> res(nx);
    for (int i=1; i<=n; i++) res[i]=((lhs[i]+rhs[i])*2)%3;
    return res;
}


int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    for (int i=0; i<9; i++) d[i].resize(nx);
    mp['J']=0; mp['O']=1; mp['I']=2;
    p[1]=qsp[1]=1;
    for (int i=2; i<nx; i++) p[i]=(p[i-1]*base)%mod, qsp[i]=(qsp[i-1]+p[i])%mod;
    cin>>n>>s[0]>>s[1]>>s[2];
    for (int i=0; i<3; i++) for (int j=1; j<=n; j++) d[i][j]=mp[(int)s[i][j-1]];
    d[3]=cross(d[0], d[1]);
    d[4]=cross(d[0], d[2]);
    d[5]=cross(d[1], d[2]);
    d[6]=cross(d[3], d[2]);
    d[7]=cross(d[4], d[1]);
    d[8]=cross(d[5], d[0]);
    for (int i=0; i<9; i++) k[i]=getval(d[i]);
    cin>>q>>t;
    st.build(1, n, 1);
    cout<<(st.check()?"Yes":"No")<<'\n';
    while (q--)
    {
        cin>>l>>r>>ch;
        st.update(1, n, 1, l, r, mp[(int)ch]);
        //cout<<"here "<<st.d[1]<<'\n';
        cout<<(st.check()?"Yes":"No")<<'\n';
    }
}

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