Second Largest Digit in a String
给一个string, 找第二大的数字.
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class Solution { public int secondHighest(String s) { Set<Integer> set = new HashSet<>(); for(char c : s.toCharArray()){ if('0' <= c && c <= '9'){ set.add(c - '0'); } } boolean largest = false; for(int i = 9; i >= 0; i--){ if(set.contains(i)){ if(!largest) largest = true; else{ return i; } } } return -1; } } |