Leimasin

#include <iostream>
#include <map>
#include <string>

using namespace std;

int main() {
    cin.sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m, k;
    cin >> n >> m >> k;

    string leimasin;
    cin >> leimasin;

    map<int, int> leimaukset;
    for(int i = 0; i < k; ++i) {
        int p;
        cin >> p;

        auto it = leimaukset.lower_bound(p);
        while(it != leimaukset.end()) {
            auto [a, b] = *it;
            if(a < p + m) {
                auto it2 = it;
                ++it2;
                leimaukset.erase(it);
                if(it2 != leimaukset.end() && it2->first <= p + m) {
                    it = it2;
                } else {
                    int d = p + m - a;
                    leimaukset.insert({a + d, b + d});
                }
            } else {
                break;
            }
        }
        leimaukset.insert({p, 0});
    }

    if(leimaukset.empty()) {
        throw 5;
    }

    string s;
    for(int i = 1; i < leimaukset.begin()->first; ++i) {
        s.push_back('.');
    }
    for(auto it = leimaukset.begin(); it != leimaukset.end(); ++it) {
        int a = it->first;
        int b = n + 1;
        int j = it->second;
        auto it2 = it;
        ++it2;
        if(it2 != leimaukset.end()) {
            b = it2->first;
        }
        for(int i = a; i < b; ++i) {
            int k = j + i - a;
            if(k >= m) {
                s.push_back('.');
            } else {
                s.push_back(leimasin[k]);
            }
        }
    }

    cout << s << "\n";

    return 0;
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 2, 3

Verdict: ACCEPTED

Test 6

Group: 2, 3

Verdict: ACCEPTED

Test 7

Group: 2, 3

Verdict: RUNTIME ERROR

Test 8

Group: 2, 3

Verdict: ACCEPTED

Test 9

Group: 3

Verdict: ACCEPTED

Test 10

Group: 3

Verdict: RUNTIME ERROR

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: RUNTIME ERROR

Test 13

Group: 3

Verdict: RUNTIME ERROR

Test 14

Group: 3

Verdict: ACCEPTED