Submission #674028

#	Time	Username	Problem	Language	Result	Execution time	Memory
674028		Vahe	Red-blue table (IZhO19_stones)	C++17	27 / 100	15 ms	1364 KiB

stones

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

int ydonc_qanaky(vector<string>& v)
{
    int ret = 0;
    int c = 0;
    for (string& s : v) { for (char& ch : s) c += (ch == (fr ? '-' : '+')); ret += 2 * c > s.size(); c = 0; }

    for (int j = 0; j < v[0].size(); j++)
    {
        for (int i = 0; i < v.size(); i++) c += v[i][j] == (!fr ? '-' : '+');
        ret += 2 * c > v.size();
        c = 0;
    }
    return ret;
}

void solve() {
    fr = 0;
    int h, w; cin >> h >> w; if (h < w) swap(h, w), fr = 1;

    string a, b;
    if (fr) { b = string(w / 2 + 1, '-'); a = string(w - w / 2 - 1, '+'); }
    else { a = string(w / 2 + 1, '+'); b = string(w - w / 2 - 1, '-'); }

    int hm = h / 2 + 1, wm = a.size();
    
    string s = a + b;
    vector<string> ans(h, s);

    for (int i = 0; i < h; i++)
    {
        int h_ = i, w_ = i / hm;
        if (w_ + wm >= w) break;
        swap(ans[h_][w_], ans[h_][w_ + wm]);
    }
    cout << ydonc_qanaky(ans) << endl;
    if (fr)
    {
        for (int j = w - 1; j >= 0; j--)
        {
            for (int i = 0; i < h; i++) cout << ans[i][j];
            cout << '\n';
        }
    }
    else for(string & s : ans) cout << s + "\n";
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t; cin >> t; while(t--)
    solve();
}

Compilation message (stderr)

stones.cpp: In function 'int ydonc_qanaky(std::vector<std::__cxx11::basic_string<char> >&)':
stones.cpp:10:90: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for (string& s : v) { for (char& ch : s) c += (ch == (fr ? '-' : '+')); ret += 2 * c > s.size(); c = 0; }
      |                                                                                    ~~~~~~^~~~~~~~~~
stones.cpp:12:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     for (int j = 0; j < v[0].size(); j++)
      |                     ~~^~~~~~~~~~~~~
stones.cpp:14:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |         for (int i = 0; i < v.size(); i++) c += v[i][j] == (!fr ? '-' : '+');
      |                         ~~^~~~~~~~~~
stones.cpp:15:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |         ret += 2 * c > v.size();
      |                ~~~~~~^~~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 10 / 10
• Subtask 3: 0 / 16
• Subtask 4: 0 / 11
• Subtask 5: 0 / 15
• Subtask 6: 0 / 31