class Solution {
public:
int titleToNumber(string s) {
int p=1,sum=0;
for(int i=int(s.length())-1; i>=0; i--){
sum=sum+(s[i]-'A'+1)*p;
p*=26;
}
return sum;
}
};
class Solution {
public:
int titleToNumber(string s) {
int p=1,sum=0;
for(int i=int(s.length())-1; i>=0; i--){
sum=sum+(s[i]-'A'+1)*p;
p*=26;
}
return sum;
}
};