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- funtion 1 : string to number
- ll to_num(string str)
- {
- ll sum=0,n=str.size()-1,i=1;
- while(n>=0)
- {
- sum+=(i*(str[n]-'0'));
- i*=10;
- // cout<<i<<endl;
- n--;
- }
- return sum;
- }
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