Submission #681404

#	Time	Username	Problem	Language	Result	Execution time	Memory
681404		drdilyor	Red-blue table (IZhO19_stones)	C++17	100 / 100	28 ms	4308 KiB

stones

#include <bits/stdc++.h>
#ifdef ONPC
    #include "t_debug.cpp"
#else
    #define debug(...) 42
#endif
using namespace std;
//namespace pbds = __gnu_pbds;
using ll = long long;
const int inf = 1e9;
const ll infl = 1e18;
const int RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
mt19937 rng(RANDOM);
template<typename T, typename U> istream& operator>>(istream& is, pair<T, U>& p) { return is >> p.first >> p.second; }
template<typename Cont> int sz(const Cont& cont) { return int(cont.size()); }
const string fileio = "";
constexpr int tests = 1, nmax = 2e5, nlog = __lg(nmax), mod = 1e9+7;

pair<int, vector<string>> construct(int n, int m) {
    vector res(n, string(m, '-'));
    int k = 0, kr = n - (n/2 + 1);
    for (int i = 0; i < n; i++) {
        int cnt = m / 2 + 1;
        while (cnt-- && k / m < kr) {
            res[i][k % m] = '+';
            k++;
        }
    }
    int a = 0, b = 0;
    for (int i = 0; i < n; i++) {
        int ca{}, cb{};
        for (int j = 0; j < m; j++) {
            if (res[i][j] == '+') ca++;
            else cb++;
        }
        a += ca > cb;
    }
    for (int i = 0; i < m; i++) {
        int ca{}, cb{};
        for (int j = 0; j < n; j++) {
            if (res[j][i] == '-') ca++;
            else cb++;
        }
        b += ca > cb;
    }
    return {a + b, res};
}

int solve() {

    int n, m;
    cin >> n >> m;
    if (!cin) return 1;
    auto a = construct(n, m);
    auto b = construct(m, n);
    debug(a.second);
    debug(b.second);
    if (b.first > a.first) {
        a.first = b.first;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                char c = b.second[j][i];
                a.second[i][j] = c == '+' ? '-' : '+';
            }
        }
    }

    cout <<a.first << '\n';
    for (auto r : a.second) {
        cout << r << '\n';
    }

    return 0;
}

signed main() {
    int t = 1;
    #ifdef ONPC
    t = 10000;
    #else
    if (fileio.size()) {freopen((fileio+".in").c_str(),"r",stdin);freopen((fileio+".out").c_str(),"w",stdout);}
    #endif
    cin.tie(0)->sync_with_stdio(0);
    if (tests) cin >> t;
    while (t-- && cin) {
        if (solve()) break;
        #ifdef ONPC
            cout << "____________________" << endl;
        #endif
    }
    return 0;
}

/*
     █████               █████  ███  ████                               
    ▒▒███               ▒▒███  ▒▒▒  ▒▒███                               
  ███████  ████████   ███████  ████  ▒███  █████ ████  ██████  ████████ 
 ███▒▒███ ▒▒███▒▒███ ███▒▒███ ▒▒███  ▒███ ▒▒███ ▒███  ███▒▒███▒▒███▒▒███
▒███ ▒███  ▒███ ▒▒▒ ▒███ ▒███  ▒███  ▒███  ▒███ ▒███ ▒███ ▒███ ▒███ ▒▒▒ 
▒███ ▒███  ▒███     ▒███ ▒███  ▒███  ▒███  ▒███ ▒███ ▒███ ▒███ ▒███     
▒▒████████ █████    ▒▒████████ █████ █████ ▒▒███████ ▒▒██████  █████    
 ▒▒▒▒▒▒▒▒ ▒▒▒▒▒      ▒▒▒▒▒▒▒▒ ▒▒▒▒▒ ▒▒▒▒▒   ▒▒▒▒▒███  ▒▒▒▒▒▒  ▒▒▒▒▒     
                                            ███ ▒███                    
                                           ▒▒██████                     
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*/

Compilation message (stderr)

stones.cpp: In function 'int solve()':
stones.cpp:5:24: warning: statement has no effect [-Wunused-value]
    5 |     #define debug(...) 42
      |                        ^~
stones.cpp:56:5: note: in expansion of macro 'debug'
   56 |     debug(a.second);
      |     ^~~~~
stones.cpp:5:24: warning: statement has no effect [-Wunused-value]
    5 |     #define debug(...) 42
      |                        ^~
stones.cpp:57:5: note: in expansion of macro 'debug'
   57 |     debug(b.second);
      |     ^~~~~
stones.cpp: In function 'int main()':
stones.cpp:81:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |     if (fileio.size()) {freopen((fileio+".in").c_str(),"r",stdin);freopen((fileio+".out").c_str(),"w",stdout);}
      |                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
stones.cpp:81:74: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |     if (fileio.size()) {freopen((fileio+".in").c_str(),"r",stdin);freopen((fileio+".out").c_str(),"w",stdout);}
      |                                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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