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171.cpp
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171.cpp
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__________________________________________________________________________________________________
sample 4 ms submission
#include <string>
#include <cmath>
#include <iostream>
using namespace std;
class Solution {
public:
// (26 ^ i) * val
int titleToNumber(string s) {
if (s.empty())
return 0;
int num = 0;
int i = s.size() - 1;
for (auto c : s) {
num += pow(26, i) * (c - 'A' + 1);
--i;
}
return num;
}
};
__________________________________________________________________________________________________
sample 7892 kb submission
class Solution {
public:
int titleToNumber(string s) {
int result = 0;
for(int i = 0; i < s.length(); i++){
result = result*26 + (s.at(i) - 'A'+1);
}
return result;
}
};
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