Submission #683751

#	Time	Username	Problem	Language	Result	Execution time	Memory
683751		NintsiChkhaidze	Red-blue table (IZhO19_stones)	C++14	53 / 100	30 ms	7888 KiB

stones

#include <bits/stdc++.h>
using namespace std;
 
const int NN = 1005;
int a[NN][NN],y[NN],x[NN],f[NN],ans,n,m,b[NN][NN];
 
void solve(int n,int m){
    ans = 0;
    int N = n - n/2 - 1,P = 0;
    for (int p = 0; p <= m; p++){
        int k = m/2 + 1 - p,ig = 0;
 
        if (k>0) ig = min(n, ((m - p)/k)*N);
        else ig = n;
 
        if (ans < m - p + ig){
            P = p;
            ans = m - p + ig;
        }
    }
 
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
            a[i][j] = 0;
 
    for (int i = 1; i <= n; i++)    
        for (int j = 1; j <= P; j++)
            a[i][j] = 1;
 
    int k = m/2 + 1 - P;
    for (int j = 1; j <= P; j++) y[j] = 0;
    for (int j = P+1; j <= m; j++) y[j] = N;
    for (int i = 1; i <= n; i++){
        int cnt = 0;
        for (int j = 1; j <= m; j++) f[j] = 0;
        for (int j = 1; j <= m; j++){
            if (y[j]) {
                --y[j];
                f[j] = 1;
                cnt++;
            }
            if (cnt == k) break;
        }
        if (cnt < k) break;
        for (int j = 1; j <= m; j++)
            if (f[j]) a[i][j] = 1;
    }
}
void rotate(){
    for (int i = 1; i <= m; i++)
        for (int j = 1; j <= n; j++)
            b[i][j] = a[i][j];
    
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= m; j++){
            a[i][j] = b[j][i];
            if (a[i][j]) a[i][j] = 0;
            else a[i][j] = 1;
        }
    }
}
signed main (){
    ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL);
 
    int T;
    cin>>T;
 
    while (T--){
        cin>>n>>m;
        
        if (m <= n) solve(m,n),rotate();
        else solve(n,m);
 
        cout<<ans<<endl;
        for (int i = 1; i <= n; i++){
            for (int j = 1; j <= m; j++){
                if (a[i][j]) cout<<"+";
                else cout<<"-";
            }
            cout<<"\n";
        }
        
    }
}

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