Submission #424192

#	Time	Username	Problem	Language	Result	Execution time	Memory
424192		doowey	Red-blue table (IZhO19_stones)	C++14	100 / 100	67 ms	3272 KiB

stones

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

const int N = 1010;


vector<vector<char>> get(int n, int m, int &sol){
    vector<vector<char>> sos;
    sos.resize(n);
    for(int i = 0 ; i < n; i ++ ){
        for(int j = 0 ; j < m ; j ++ ){
            sos[i].push_back('-');
        }
    }
    for(int i = 0 ; i < n; i ++ ){
        for(int j = 0; j < (m + 2) / 2; j ++ ){
            sos[i][j] = '+';
        }
    }
    int xx;
    int take;
    for(int jj = 0 ; jj < (m + 2) / 2; jj ++ ){
        if((jj + 1) * ((n + 2) / 2) > ((m - 1) / 2) * ((n - 1) / 2))
            break;
        xx = jj-1;
        for(int id = 0; id < (n + 2) / 2; id ++ ){
            xx ++ ;
            xx %= (m - 1)/2;
            sos[id][jj] = '-';
            sos[id][xx+(m+2)/2] = '+';
        }
    }
    sol = 0;
    int cnt;
    for(int i = 0 ; i < n; i ++ ){
        cnt = 0;
        for(int j = 0 ; j < m ; j ++ ){
            if(sos[i][j] == '+'){
                cnt ++ ;
            }
        }
        if(cnt >= (m + 2) / 2){
            sol ++ ;
        }
    }
    for(int j = 0 ; j < m ; j ++ ){
        cnt = 0;
        for(int i = 0 ; i < n; i ++ ){
            if(sos[i][j] == '-'){
                cnt ++ ;
            }
        }
        if(cnt >= (n + 2) / 2){
            sol ++ ;
        }
    }
    return sos;
}

void solve(){
    int n, m;
    cin >> n >> m;
    int res1 = 0;
    int res2 = 0;
    vector<vector<char>> s1 = get(n, m, res1);
    vector<vector<char>> s2 = get(m, n, res2);
    if(res1 >= res2){
        cout << res1 << "\n";
        for(auto x : s1){
            for(auto y : x){
                cout << y;
            }
            cout << "\n";
        }
    }
    else{
        cout << res2 << "\n";
        for(int i = 0 ; i < n; i ++ ){
            for(int j = 0 ; j < m ; j ++ ){
                if(s2[j][i] == '-'){
                    s2[j][i] = '+';
                }
                else{
                    s2[j][i] = '-';
                }
                cout << s2[j][i];
            }
            cout << "\n";
        }

    }
}

int main(){
    fastIO;
    //freopen("in.txt","r",stdin);
    int tc;
    cin >> tc;
    for(int iq = 1; iq <= tc; iq ++ ){
        solve();
    }
    return 0;
}

Compilation message (stderr)

stones.cpp: In function 'std::vector<std::vector<char> > get(int, int, int&)':
stones.cpp:30:9: warning: unused variable 'take' [-Wunused-variable]
   30 |     int take;
      |         ^~~~

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