Submission #655247

#	Time	Username	Problem	Language	Result	Execution time	Memory
655247		speedyArda	Red-blue table (IZhO19_stones)	C++14	38 / 100	41 ms	1772 KiB

stones

#pragma GCC optimize ("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")
#include "bits/stdc++.h"
#define pb push_back
#define vll vector<long long>
#define vb vector<bool>
#define vi vector<int>
#define vs vector<string>
#define vpii vector< pair<int, int> >
#define pii pair<int, int>
#define pbb pair<bool, bool>
#define pll pair<long long, long long>
#define vvi vector< vector<int> > 
#define ld long double
#define mp make_pair
#define FASTIO ios_base::sync_with_stdio(false); cin.tie(NULL);
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
using namespace std;
using ll = long long;

int main() 
{
    int t;
    cin >> t;
    while(t--)
    {
        int n, m;
        cin >> n >> m;
        int cnt = 0;
        int ans = 0;
        char res[n + 5][m + 5];
        if(n > m)
        {
            //fill(res, sizeof(res), '+');
            ans = n;
            for(int i = 1; i <= n; i++)
                for(int a = 1; a <= m; a++)
                    res[i][a] = '+';
            int i = 1;
            for(i = 1; i <= m; i++)
            {
                if(cnt + 1 >= (m+1) / 2)
                    break;
                for(int a = 1; a <= n / 2 + 1; a++)
                    res[a][i] = '-';
                ans++;
                cnt++;
            }
            if((n % 2 == 0 && m - i > 2) || (n % 2 == 1 && m - i > 1)) {
                
                ans--;
                if(n % 2 == 0)
                    ans--;
                cnt = 0;
                for(; i <= m; i++)
                {
                    if(cnt + 1 >= (m+1) / 2)
                        break;
                    for(int a = (n+1)/2; a <= n; a++)
                        res[a][i] = '-';
                    ans++;
                    cnt++;
                } 
            }
            
        } else 
        {
            //fill(res, sizeof(res), '-');
            ans = m;
            for(int i = 1; i <= n; i++)
                for(int a = 1; a <= m; a++)
                    res[i][a] = '-';  
            int i = 1;
            //cnt = 0;
            for(i = 1; i <= n; i++)
            {
                if(cnt + 1 >= (n+1) / 2)
                    break;
                for(int a = 1; a <= m / 2 + 1; a++)
                    res[i][a] = '+';
                ans++;
                cnt++;
            } 
            
            if((m % 2 == 0 && n - i > 2) || (m % 2 == 1 && n - i > 1)) {
                //break;
                ans--;
                if(m % 2 == 0)
                    ans--;
                cnt = 0;
                for(; i <= n; i++)
                {
                    if(cnt + 1 >= (n+1) / 2)
                        break;
                    for(int a = (m+1)/2; a <= m; a++)
                        res[i][a] = '+';
                    ans++;
                    cnt++;
            } 
            }
        }
        cout << ans << "\n";
        for(int i = 1; i <= n; i++)
        {
            for(int a = 1; a <= m; a++)
                cout << res[i][a];
            cout << "\n";
        }
    }
}

Compilation message (stderr)

stones.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    3 | #pragma GCC optimization ("unroll-loops")
      |

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