Submission #1107650

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107650		0pt1mus23	Bliskost (COI23_bliskost)	C++14	100 / 100	116 ms	24300 KiB

Main

// HELLLLLLLNAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
#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;
    vector<int> pref(n,0);
    for(int i=0;i<n;i++){
        pref[i]=(t[i]-s[i] + 26)%26;    
        if(i){
            pref[i]=(-pref[i-1] + pref[i] + 26)%26;
        }
    }
    if(pref.back()==0){
        cout<<"da\n";
    }
    else{
        cout<<"ne\n";
    }
    int tot = 0;
    while(q--){
        int idx;
        cin>>idx;
        char c;
        cin>>c;
        --idx;
        int diff = c - s[idx];
        // cout<<diff<<endl;
        s[idx]=c;
        if((n-idx)&1){
            pref.back()=(pref.back() + 26  - diff)%26; 
        }
        else{
            pref.back()=(pref.back() + diff + 26)%26;
        }
        if(pref.back()==0){
            cout<<"da\n";
        }
        else{
            cout<<"ne\n";
        }
    }    
    /*
    
    amelelik : 

    ab | bb
    pref: 1 25

    2 a , -1, b->b, b->a->b
    perf : 1 0 
    ferq tek olanda, last positiona tesir elemir

    1 b : 1,  aa -. ba
    pref : 0,1
    */
}

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    int tt = 1; 
    // cin>>tt;

    while(tt--){
        rush();
    }

    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void rush()':
Main.cpp:30:9: warning: unused variable 'tot' [-Wunused-variable]
   30 |     int tot = 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