Submission #1212069

#	Time	Username	Problem	Language	Result	Execution time	Memory
1212069		shrek_lover	Bliskost (COI23_bliskost)	C++20	100 / 100	154 ms	9832 KiB

Main

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

const int mxn = 1e6 + 10;
string str, target;
int n, q, shrek[mxn];

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> q;
    cin >> str >> target;

    int O = 0, E = 0, SUS = 0;
    for(int i = 0; i < n; i++) {
        int a = str[i] - 'a';
        int t = target[i] - 'a';
        shrek[i] = a;

        if(i & 1) {
            O = (O + a) % 26;
            SUS = (SUS - t + 26) % 26;
        }
        else {
            E = (E + a) % 26;
            SUS = (SUS + t) % 26;
        }
    }

    // cout << E << " - " << O << " = " << SUS << endl;

    if(E == (O + SUS) % 26) cout << "da\n";
    else cout << "ne\n";

    while(q--) {
        int i; char x;
        cin >> i >> x;
        x -= 'a';
        i--;

        if(i & 1) {
            O = (O - shrek[i] + 26) % 26;
            O = (O + x) % 26;
        }
        else {
            E = (E - shrek[i] + 26) % 26;
            E = (E + x) % 26;
        }

        shrek[i] = x;
        if(E == (O + SUS) % 26) cout << "da\n";
        else cout << "ne\n";
    }
    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