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Create 2309.-Greatest-English-Letter-in-Upper-and-Lower-Case.java

Contest 298 problem 1

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	`1`	`+//Contest 298 brute-force feel free to share any improvements`
	`2`	`+classSolution {`
	`3`	`+publicStringgreatestLetter(Strings) {`
	`4`	`+HashSet<Integer>set =newHashSet<>();`
	`5`	`+intans = -1;`
	`6`	`+for (inti =0;i<s.length();i++) {`
	`7`	`+if (set.contains((s.charAt(i)-32)) \|\|set.contains((s.charAt(i)+32)))`
	`8`	`+ans =Math.max(ans, (int)Character.toUpperCase(s.charAt(i)));`
	`9`	`+set.add(0+s.charAt(i));`
	`10`	`+ }`
	`11`	`+returnans==-1?"":(char)ans+"";`
	`12`	`+ }`
	`13`	`+}`

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