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171_titleToNumber.java

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public class Solution {

public int titleToNumber(String s) {

if(s == null || "".equals(s)) return 0;

int result = 0;

for(int i = 0; i < s.length(); i++){

char c = s.charAt(i);

result = result*26 + convert(c);

}

return result;

}

public int convert(char c){

return c-'A'+1;

}

}