├── Chef and NextGen.cpp
├── Find maximum in an Array.cpp
└── Lucky Four.cpp


/Chef and NextGen.cpp:
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 1 | #include <bits/stdc++.h>
 2 | using namespace std;
 3 | 
 4 | int main() {
 5 | 	int t;
 6 | 	cin >> t;
 7 | 	while(t--)
 8 | 	{
 9 | 	    int a,b,x,y;
10 | 	    cin >>  a >>  b  >> x >> y;
11 | 	    if(a*b <= x*y)
12 | 	    {
13 | 	        cout << "YES" << endl;
14 | 	    }
15 | 	    else
16 | 	    {
17 | 	        cout << "NO" << endl;
18 | 	    }
19 | 	}
20 | 	return 0;
21 | }
22 | 


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/Find maximum in an Array.cpp:
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 1 | #include <bits/stdc++.h>
 2 | using namespace std;
 3 | 
 4 | int main() {
 5 | 	int t;
 6 | 	cin >> t;
 7 | 	while(t--)
 8 | 	{
 9 | 	    int a;
10 | 	    cin >> a;
11 | 	    vector<int> arr(a);
12 | 	    for(int i=0;i<a;i++)
13 | 	    {
14 | 	        cin >> arr[i];
15 | 	    }
16 | 	    sort(arr.begin(),arr.end());
17 | 	    cout << arr[arr.size()-1] << endl;
18 | 	}
19 | 	return 0;
20 | }
21 | 


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/Lucky Four.cpp:
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 1 | #include <bits/stdc++.h>
 2 | using namespace std;
 3 | 
 4 | int main() {
 5 | 	int t;
 6 | 	cin >> t;
 7 | 	int count =0;
 8 | 	for(int i=0;i<t;i++)
 9 | 	{
10 | 	    string a;
11 | 	    cin >> a;
12 | 	    int b = a.length();
13 | 	    for(int j=0;j< b;j++)
14 | 	    {
15 | 	        if(a[j] == '4')
16 | 	        {
17 | 	            count++;
18 | 	        }
19 | 	    }
20 | 	    cout << count <<endl;
21 | 	    count =0;
22 | 	}
23 | 	return 0;
24 | } 
25 | 


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