class Solution {
public:
bool checkIfPangram(string s) {
int n=s.size();
vector<bool> v(26,false);
if(n<26) return false;
else if(n>=26)
{
for(int i=0;i<n;i++)
{
v[s[i]-'a']=true;
}
}
for(int i=0;i<26;i++)
{
if(v[i]==false) return false;
}
return true;
}
};
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