Submission #500240

#	Time	Username	Problem	Language	Result	Execution time	Memory
500240		reni	Red-blue table (IZhO19_stones)	C++14	100 / 100	25 ms	2252 KiB

stones

#include<iostream>
#pragma GCC optimize ("-O3")
#define endl '\n'
using namespace std;
char s[1003][1003];
long long br[1003];
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    long long n,m,i,j,t,ans,i2, num=0;
    bool isf;

    cin>>t;

    while(t--)
    {
        cin>>n>>m;
        isf=0;
        if(n<m){swap(n,m); isf=1;}

        ans=0;

        for(i=1;i<=n;i++)
        {
            for(j=1;j<=m;j++)
            {
                s[i][j]='+';
            }
            br[i]=0;
        }
        num=0;j=1;
        for(i=1;i<=n;i++)
        {
            if(br[i]==m-(m/2+1))break;
                s[i][j]='-';
                br[i]++;num++;
            if(num==(n/2+1)){num=0;ans++;j++;}
            if(i==n)i=0;

        }
        ans+=n;
      
        cout<<ans<<endl;
        if(!isf)
        {
            for(i=1;i<=n;i++)
            {
             for(j=1;j<=m;j++)
            {
                    cout<<s[i][j];
            }  cout<<endl;
        }
        }
        else
        {
            for(i=1;i<=m;i++)
            {
              for(j=1;j<=n;j++)
             {
                    if(s[j][i]=='+')cout<<'-';
                    else cout<<'+';
            } cout<<endl;
        }

        }

    }

}

Compilation message (stderr)

stones.cpp: In function 'int main()':
stones.cpp:13:29: warning: unused variable 'i2' [-Wunused-variable]
   13 |     long long n,m,i,j,t,ans,i2, num=0;
      |                             ^~

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