Submission #697471

#	Time	Username	Problem	Language	Result	Execution time	Memory
697471		Sandarach151	Crossing (JOI21_crossing)	C++17	3 / 100	518 ms	1048576 KiB

Main

#include <bits/stdc++.h>
using namespace std;

struct node{
    node *l, *r;
    int start, mid, end;
    char curequals, targequals;
    bool equals;
    string cur;
    string targ;
    node(int _start, int _end, string _cur, string _targ): start(_start), mid((_start+_end)/2), end(_end), cur(_cur), targ(_targ){
        if(start!=end){
            l = new node(start, mid, cur, targ);
            r = new node(mid+1, end, cur, targ);
            if(l->targequals==r->targequals){
                this->targequals=l->targequals;
            }
            else{
                this->targequals='0';
            }
            if(l->curequals==r->curequals){
                this->curequals=l->curequals;
            }
            else{
                this->curequals='0';
            }
            this->equals=(l->equals && r->equals);
        }
        else{
            this->targequals = targ[start];
            this->curequals = cur[start];
            this->equals = (this->targequals==this->curequals);
        }
    }
    void update(char c, int left, int right){
        if(start==left && end==right){
            this->curequals = c;
            this->equals = (this->targequals!='0' && this->curequals==this->targequals);
        }
        else{
            if(this->curequals!='0'){
                l->curequals = this->curequals;
                l->equals = (l->targequals==l->curequals);
                r->curequals = this->curequals;
                r->equals = (r->targequals==r->curequals);
                this->curequals = '0';
            }
            if(left>mid){
                r->update(c, left, right);
            }
            else if(right<=mid){
                l->update(c, left, right);
            }
            else{
                l->update(c, left, mid);
                r->update(c, mid+1, right);
            }
            this->equals = (r->equals && l->equals);
        }
    }
};

int main(){
    int n;
    cin >> n;
    string a, b, c;
    cin >> a >> b >> c;
    int q;
    cin >> q;
    string init;
    cin >> init;
    node root(0, n-1, init, a);
    if(root.equals){
        cout << "Yes\n";
    }
    else{
        cout << "No\n";
    }
    for(int i=0; i<q; i++){
        int d, e;
        char f;
        cin >> d >> e >> f;
        d--;
        e--;
        root.update(f, d, e);
        if(root.equals){
        cout << "Yes\n";
        }
        else{
            cout << "No\n";
        }
    }
    return 0;
}

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