Submission #463634

#	Time	Username	Problem	Language	Result	Execution time	Memory
463634		fcmalkcin	Red-blue table (IZhO19_stones)	C++17	38 / 100	38 ms	3144 KiB

stones

#pragma GCC optimize("Ofast")
#pragma GCC optimization("unroll-loops, no-stack-protector")
#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>

using namespace std;
#define ll  long long
#define ull unsigned ll
#define pll pair<ll,ll>
#define ff first
#define ss second
#define pb push_back
#define endl "\n"

const ll maxn=2e3+100;
const ll mod =1e9+7;
const ll base=3e18;

/// you will be the best but now you just are trash
/// goal 5/7

char ans[maxn][maxn];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    if (fopen("t.inp", "r"))
    {
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    ll t;
    cin>> t;
    while (t--)
    {
        ll n, m;
        ll res=0;
        cin>> n>> m;
        if (n+(m-1)/2>res)
        {
            res=n+(m-1)/2;
            for (int i=1; i<=n; i++)
            {
                for (int j=1; j<=m; j++)
                {
                    if (j<=m-(m-1)/2)
                    {
                        ans[i][j]='+';
                    }
                    else
                    {
                        ans[i][j]='-';
                    }
                }
            }
        }
        if (n>=(n%2?1:2)&&n-(n%2?1:2)+((m-1)/2)*2>res)
        {
            res=n-(n%2?1:2)+((m-1)/2)*2;
            ll len=(m-1)/2;
            ll len1=(n/2)+1;
            for (int i=1; i<=n; i++)
            {
                for (int j=1; j<=m; j++)
                {
                    if (i<=len1&&j<=len)
                    {
                        ans[i][j]='-';
                    }
                    else if (i>=n-len1+1&&j>=len+1&&j<=2*len)
                    {
                        ans[i][j]='-';
                    }
                    else
                    {
                        ans[i][j]='+';
                    }
                    //    cout <<ans[i][j];
                }
                // cout <<endl;
            }
        }
        if ((n-1)/2+m>res)
        {
            res=(n-1)/2+m;
            for (int i=1; i<=n; i++)
            {
                for (int j=1; j<=m; j++)
                {
                    if (i<=n-(n-1)/2)
                    {
                        ans[i][j]='-';
                    }
                    else
                    {
                        ans[i][j]='+';
                    }
                }
            }
        }
        if (m>=(m%2?1:2)&&m-(m%2?1:2)+((n-1)/2)*2>res)
        {
            res=m-(m%2?1:2)+((n-1)/2)*2;
            //  cout <<res<<endl;
            ll len=(n-1)/2;
            ll len1=(m/2)+1;
            for (int i=1; i<=n; i++)
            {
                for (int j=1; j<=m; j++)
                {
                    if (j<=len1&&i<=len)
                    {
                        ans[i][j]='+';
                    }
                    else if (j>=m-len1+1&&i>=len+1&&i<=2*len)
                    {
                        ans[i][j]='+';
                    }
                    else
                    {
                        ans[i][j]='-';
                    }
                 //   cout <<ans[i][j];
                }
               // cout <<endl;
            }
        }
        cout <<res<<endl;
        for (int i=1;i<=n;i++)
        {
            for (int j=1;j<=m;j++) cout <<ans[i][j];
            cout <<endl;
        }
    }


}

Compilation message (stderr)

stones.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization("unroll-loops, no-stack-protector")
      | 
stones.cpp: In function 'int main()':
stones.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
stones.cpp:33:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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