Submission #1107821

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107821		0pt1mus23	Bliskost (COI23_bliskost)	C++14	100 / 100	132 ms	16348 KiB

Main

// HELLNAH 2
#include <bits/stdc++.h>
using namespace std;
#define int long long int
#define ins insert      
#define pb push_back
#define endl '\n'
#define putr(x) cout<<x<<endl;return; 
#define all(x) x.begin(),x.end()
const int mod = 1e9 +7, sze = 1e5 +5, inf = INT_MAX, LL = 30;
 
void rush(){

    int n,q;
    cin>>n>>q;
    string s,t;
    cin>>s>>t;
    int sum=0;
    for(int i=0;i<n;i++){
        sum=(-sum + t[i]-s[i] + 26)%26;
    }
    cout<<(sum? "ne":"da")<<endl;
    while(q--){
        int idx;
        cin>>idx;
        char c;
        cin>>c;
        int diff = c - s[--idx];
        s[idx]=c;
        sum= (sum+26  + diff + ( (n-idx)&1) * -2 * diff )%26;
        /* ala bu tek cut sohbet i seye gore imis 
            tek olanda : -d +d -d +d -d
                                      ^ last
            cut olanda : -d +d -d +d 
                                   ^ last 
        */                      
        cout<<(sum? "ne":"da")<<endl;
    }
}
 
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
 
    int tt = 1; 
    // cin>>tt;
 
    while(tt--){
        rush();
    }
 
    return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 12 / 12
• Subtask 5: 17 / 17
• Subtask 6: 43 / 43