Submission #672231

#	Time	Username	Problem	Language	Result	Execution time	Memory
672231		YENGOYAN	Red-blue table (IZhO19_stones)	C++17	38 / 100	64 ms	3532 KiB

stones

#include <bits/stdc++.h>

using namespace std;

int calc(vector<string> &v, int n, int m){
    int cnt = 0;
    for(int i = 0; i < n; i++){
        int a = 0, b= 0 ;
        for(int j = 0; j < m; j++){
            if(v[i][j] == '+') a++;
            else b++;
        }
        cnt += (a > b);
    }
    for(int j = 0; j < m; j++){
        int a = 0, b = 0;
        for(int i = 0; i < n; i++){
            if(v[i][j] == '-') a++;
            else  b++;
        }
        cnt += (a > b);
    }
    return cnt;
}

void printVec(vector<string> &v, int n, int m){
    for(int i = 0; i < n; i++){
        for(int j = 0; j < m; j++){
            cout << v[i][j];
        }
        cout << endl;
    }
}

vector<string> rev(vector<string> v, int n, int m){
    vector<string> a(m);
    for(int i = 0; i < n; ++i){
        for(int j = m - 1; j >= 0; --j){
            if(v[i][j]  == '+') a[m - j - 1].push_back('-');
            else a[m - j - 1].push_back('+');
        }
    }
    return a;
}

void GarniGeghard(int n, int m){
    if (n + (m + 1) / 2 - 1 > m + (n + 1) / 2 - 1) {
        cout << n + (m + 1) / 2 - 1 << endl;
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= m; j++) {
                if (j <= m / 2 + 1) cout << '+';
                else cout << '-';
            }
            cout << "\n";
        }
    }
    else {
        cout << m + (n + 1) / 2 - 1 << endl;
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= m; j++) {
                if (i <= n / 2 + 1) cout << '-';
                else cout << '+';
            }
            cout << "\n";
        }
    }
}

void solve(){
    int n, m; cin >> n >> m;
    bool r = 0;
    if (min(m, n) <= 3 || (n <= 4 && m <= 4)) {
        GarniGeghard(n, m);
        return;
     }
    if(n > m){
        swap(n, m);
        r = 1;
    }
    vector<string> v(n);
    string s(m, '-');
    v[0] = s;
    if(n % 2 == 0  && n > 1) v[1] = s;
    string a(m / 2 + 1, '+'), b(m - (m / 2 + 1), '-');
    for(int i = 1 + (1 - (n % 2)); i < n; i++){
        if(i % 2) v[i] = a + b;
        else v[i] = b + a;
    }
    if(r){
        v = rev(v, n, m);
        swap(n, m);
    }
    int res = calc(v, n, m);
    if(res < max(n + (m + 1) / 2 - 1, m + (n + 1) / 2 - 1)){
        GarniGeghard(n, m);
        return;
    }
    cout << calc(v, n, m) << endl;
//    if(!r) printVec(v, n, m);
    printVec(v, n, m);

}

int main(){
    int t; cin >> t; while(t--)
        solve();
}

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