help me in solving this problem

help
1

#include<bits/stdc++.h>
using namespace std;

bool cansum(vector& num,vector& dp,int x)
{
if(x==0)
return true;
if(x<0)
return false;
if(dp)
return dp;

for(int i=0;i<num.size();i++)
{
    if(cansum(num,dp,x-num[i]))
    {
        dp[x]=1;
        return true;
    }
}
dp[x]=0;
return false;

}
int main()
{ int x=300;
vector num{7,14};

 vector<int> dp(x+1,0);
 cout<<cansum(num,dp,x);
 return 0;

}

why is this TLE?