Monikulmio

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

ll n, m, k;
string s[101010];
vector<pair<int, int>> v;
set<int> z[101010];

void lisaa(int a, int b) {
    s[a][b-1] = '*';
}

void liita(int a1, int b1, int a2, int b2) {
    b1 -= 1;
    b2 -= 1;
    if (v.size() < 3) {
        if(!z[a1].contains(b1)) {v.emplace_back(a1, b1); z[a1].insert(b1);}
        if(!z[a2].contains(b2)) {v.emplace_back(a2, b2); z[a2].insert(b2);}
    }
    if (a1 == a2) {
        if (b1 > b2) swap(b1, b2);
        for (int i = b1+1; i < b2; i++) {
            s[a1][i] = '=';
        }
    }
    else if (b1 == b2) {
        if (a1 > a2) swap(a1, a2);
        for (int i = a1+1; i < a2; i++) {
            s[i][b1] = '|';
        }
    }
    else {
        if (a1 > a2) {swap(a1, a2); swap(b1, b2);}
        if (b2 > b1) {
            for (int i = 1; i < a2-a1; i++) {
                s[a1+i][b1+i] = '\\';
            }
        }
        else {
            for (int i = 1; i < a2-a1; i++) {
                s[a1+i][b1-i] = '/';
            }
        }
    }
}

void tayta(int a, int b) {
    if (s[a][b] != '#') return;
    s[a][b] = '.';
    //cout << "a: " << a << " b: " << b << " s[a][b]: " << s[a][b] << endl;
    tayta(a, b+1);
    tayta(a, b-1);
    tayta(a+1, b);
    tayta(a-1, b);
}

int main() {
    //ios_base::sync_with_stdio(false);
    //cin.tie(nullptr);
    //freopen(R"(C:\Users\Kymppi\Downloads\test_input.txt)", "r", stdin);

    cin >> n >> m >> k;

    for (int i = 1; i <= n; i++) {
        s[i] = string(m, '#');
    }

    int f1 = 0, f2 = 0;
    int l1 = 0, l2 = 0;

    for (int i = 1; i <= k; i++) {
        int a, b;
        cin >> a >> b;
        if (i == 1) {
            f1 = a;
            f2 = b;
        }else {
            liita(l1, l2, a, b);
        }
        l1 = a;
        l2 = b;
        lisaa(a, b);
        if (i == k) {
            liita(f1, f2, a, b);
        }
    }

    //cout << "v.size(): " << v.size() << endl;
    /*if (v.size() == 3) {
        int avga=0,avgb=0;
        for(int i=0;i<v.size();i++) {
            avga+=v[i].first;
            avgb+=v[i].second;
        }
        avga/=3;
        avgb/=3;
        //cout << "avga: " << avga << endl;
        //cout << "avgb: " << avgb << endl;
        tayta(avga, avgb);
    }*/

    tayta(1, 0);

    for (int i = 1; i <= n; i++) {
        cout << s[i] << "\n";
    }
}

Test 1 (public)

Verdict: ACCEPTED

Test 2 (public)

Verdict: ACCEPTED

Test 3 (public)

Verdict: ACCEPTED

Test 4 (public)

Verdict: ACCEPTED

Test 5 (public)

Verdict: ACCEPTED

Test 6 (public)

Verdict: WRONG ANSWER

Test 7 (public)

Verdict: ACCEPTED

Test 8 (public)

Verdict: ACCEPTED

Test 9 (public)

Verdict: ACCEPTED

Test 10 (public)

Verdict: ACCEPTED