Submission #846806

#	Time	Username	Problem	Language	Result	Execution time	Memory
846806		Abito	Crossing (JOI21_crossing)	C++17	26 / 100	158 ms	15380 KiB

Main

#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
#define int long long
#define y1 YONE
typedef unsigned long long ull;
using namespace std;
const int N=2e5+5;
int n,seg[4*N+5],q,po[N],pj[N],pi[N];
char a[N],b[N],lazy[4*N+5];
int build(int node,int l,int r){
    lazy[node]='A';
    if (l==r) return seg[node]=(a[l]==b[l]);
    int mid=(l+r)/2;
    return seg[node]=build(node*2,l,mid)+build(node*2+1,mid+1,r);
}
int edit(int node,int l,int r,int lx,int rx,char x){
    if (r<lx || l>rx){
        if (lazy[node]!='A'){
            if (lazy[node]=='O') seg[node]=po[r]-po[l-1];
            elif (lazy[node]=='J') seg[node]=pj[r]-pj[l-1];
            else seg[node]=pi[r]-pi[l-1];
        }return seg[node];
    }
    if (l>=lx && r<=rx){
        lazy[node]=x;
        if (lazy[node]=='O') seg[node]=po[r]-po[l-1];
        elif (lazy[node]=='J') seg[node]=pj[r]-pj[l-1];
        else seg[node]=pi[r]-pi[l-1];
        return seg[node];
    }int mid=(l+r)/2;
    if (lazy[node]!='A'){
        lazy[node*2]=lazy[node];
        lazy[node*2+1]=lazy[node];
        lazy[node]='A';
    }return seg[node]=edit(node*2,l,mid,lx,rx,x)+edit(node*2+1,mid+1,r,lx,rx,x);
}
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin>>n;
    for (int i=0;i<3;i++) for (int i=1;i<=n;i++) cin>>a[i];
    for (int i=1;i<=n;i++){
        po[i]=po[i-1],pj[i]=pj[i-1],pi[i]=pi[i-1];
        if (a[i]=='J') pj[i]++;
        elif (a[i]=='O') po[i]++;
        else pi[i]++;
    }
    cin>>q;
    for (int i=1;i<=n;i++) cin>>b[i];
    build(1,1,n);
    if (seg[1]==n) cout<<"Yes"<<endl;
    else cout<<"No"<<endl;
    while (q--){
        int l,r;char x;cin>>l>>r>>x;
        edit(1,1,n,l,r,x);
        if (seg[1]==n) cout<<"Yes"<<endl;
        else cout<<"No"<<endl;
    }
    return 0;
}

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