Language: C++

#include <iostream>
using namespace std;
#define ll long long

map<pair<ll, ll>, ll> m;

ll wt[101], val[101],n,W;

ll max(ll a, ll b){
    return (a>b)?a:b;
}

ll knapSack(ll W, ll n) 
{ 
   // Base Case 
   if (n == 0 || W == 0) 
       return 0; 
    if(m[{W, n}]) return m[{W, n}];
   // If weight of the nth item is more than Knapsack capacity W, then 
   // this item cannot be included in the optimal solution 
   if (wt[n-1] > W) 
       return knapSack(W, wt, val, n-1); 
  
   // Return the maximum of two cases:  
   // (1) nth item included  
   // (2) not included 
   else return max( val[n-1] + knapSack(W-wt[n-1], n-1), 
                    knapSack(W, n-1) 
                  ); 
} 
  

int main() {
	// your code goes here
	cin >> n >> W;
	for(int i=0;i<n;i++)
	{
	    cin >> wt >> val[i];
	}
	cout << knapSack(W,n) << "\n";
	return 0;
}


Compiler output:
a.cc:5:1: error: 'map' does not name a type
    5 | map<pair<ll, ll>, ll> m;
      | ^~~
a.cc: In function 'long long int knapSack(long long int, long long int)':
a.cc:18:8: error: 'm' was not declared in this scope
   18 |     if(m[{W, n}]) return m[{W, n}];
      |        ^
a.cc:22:27: error: invalid conversion from 'long long int*' to 'long long int' [-fpermissive]
   22 |        return knapSack(W, wt, val, n-1);
      |                           ^~
      |                           |
      |                           long long int*
a.cc:22:23: error: too many arguments to function 'long long int knapSack(long long int, long long int)'
   22 |        return knapSack(W, wt, val, n-1);
      |               ~~~~~~~~^~~~~~~~~~~~~~~~~
a.cc:13:4: note: declared here
   13 | ll knapSack(ll W, ll n)
      |    ^~~~~~~~
a.cc: In function 'int main()':
a.cc:38:17: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'long long int [101]')
   38 |             cin >> wt >> val[i];
      |             ~~~ ^~ ~~
      |             |      |
      |             |      long long int [101]
      |             std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/iostream:42,
                 from a.cc:1:
/usr/include/c++/14/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:38:20: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'long long int*'
   38 |             cin >> wt >> val[i];
      |                    ^~
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:38:20: error: invalid conversion from 'long long int*' to 'short int' [-fpermissive]
   38 |             cin >> wt >> val[i];
      |                    ^~
      |                    |
      |                    long long int*
a.cc:38:20: error: cannot bind rvalue '(short int)((long long int*)(& wt))' to 'short int&'
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:38:20: error: invalid conversion from 'long long int*' to 'short unsigned int' [-fpermissive]
   38 |             cin >> wt >> val[i];
      |                    ^~
      |                    |
      |                    long long int*
a.cc:38:20: error: cannot bind rvalue '(short unsigned int)((long long int*)(& wt))' to 'short unsigned int&'
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:38:20: error: invalid conversion from 'long long int*' to 'int' [-fpermissive]
   38 |             cin >> wt >> val[i];
      |                    ^~
      |                    |
      |                    long long int*
a.cc:38:20: error: cannot bind rvalue '(int)((long long int*)(& wt))' to 'int&'
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:38:20: error: invalid conversion from 'long long int*' to 'unsigned int' [-fpermissive]
   38 |             cin >> wt >> val[i];
      |                    ^~
      |                    |
      |                    long long int*
a.cc:38:20: error: cannot bind rvalue '(unsigned int)((long long int*)(& wt))' to 'unsigned int&'
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:38:20: error: invalid conversion from 'long long int*' to 'long int' [-fpermissive]
   38 |             cin >> wt >> val[i];
      |                    ^~
      |                    |
      |                    long long int*
a.cc:38:20: error: cannot bind rvalue '(long int)((long long int*)(& wt))' to 'long int&'
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:38:20: error: invalid conversion from 'long long int*' to 'long unsigned int' [-fpermissive]
   38 |             cin >> wt >> val[i];
      |                    ^~
      |                    |
      |                    long long int*
a.cc:38:20: error: cannot bind rvalue '(long unsigned int)((long long int*)(& wt))' to 'long unsigned int&'
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:38:20: error: invalid conversion from 'long long int*' to 'long long int' [-fpermissive]
   38 |             cin >> wt >> val[i];
      |                    ^~
      |                    |
      |                    long long int*
a.cc:38:20: error: cannot bind rvalue '(long long int)((long long int*)(& wt))' to 'long long int&'
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:38:20: error: invalid conversion from 'long long int*' to 'long long unsigned int' [-fpermissive]
   38 |             cin >> wt >> val[i];
      |                    ^~
      |                    |
      |                    long long int*
a.cc:38:20: error: cannot bind rvalue '(long long unsigned int)((long long int*)(& wt))' to 'long long unsigned int&'
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:38:20: error: cannot bind non-const lvalue reference of type 'void*&' to an rvalue of type 'void*'
   38 |             cin >> wt >> val[i];
      |                    ^~
/usr/include/c++/14/istream:219:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:25: note:   no known conversion for argument 1 from 'long long int [101]' to 'float&'
  219 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/usr/include/c++/14/istream:223:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:26: note:   no known conversion for argument 1 from 'long long int [101]' to 'double&'
  223 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/usr/include/c++/14/istream:227:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:31: note:   no known conversion for argument 1 from 'long long int [101]' to 'long double&'
  227 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_