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refactor 1137

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`2`	`2`
`3`	`3`	`importjava.util.stream.IntStream;`
`4`	`4`
`5`		`-/**`
`6`		`- * 1137. N-th Tribonacci Number`
`7`		`- *`
`8`		`- * The Tribonacci sequence Tn is defined as follows:`
`9`		`- *`
`10`		`- * T0 = 0, T1 = 1, T2 = 1, and Tn+3 = Tn + Tn+1 + Tn+2 for n >= 0.`
`11`		`- *`
`12`		`- * Given n, return the value of Tn.`
`13`		`- *`
`14`		`- * Example 1:`
`15`		`- * Input: n = 4`
`16`		`- * Output: 4`
`17`		`- *`
`18`		`- * Explanation:`
`19`		`- * T_3 = 0 + 1 + 1 = 2`
`20`		`- * T_4 = 1 + 1 + 2 = 4`
`21`		`- *`
`22`		`- * Example 2:`
`23`		`- * Input: n = 25`
`24`		`- * Output: 1389537`
`25`		`- *`
`26`		`- * Constraints:`
`27`		`- * 0 <= n <= 37`
`28`		`- * The answer is guaranteed to fit within a 32-bit integer, ie. answer <= 2^31 - 1.`
`29`		`- * */`
`30`	`5`	`publicclass_1137 {`
`31`	`6`	`publicstaticclassSolution1 {`
`32`	`7`	`publicinttribonacci(intn) {`

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