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Merge pull requestneetcode-gh#2483 from leahjia/leah

Create: 2001-number-of-pairs-of-interchangeable-rectangles.java

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	`1`	`+classSolution {`
	`2`	`+publiclonginterchangeableRectangles(int[][]rectangles) {`
	`3`	`+Map<Double,Long>count =newHashMap<>();`
	`4`	`+for (int[]rec :rectangles) {`
	`5`	`+doublekey = (double)rec[0] /rec[1];`
	`6`	`+count.put(key,count.getOrDefault(key, (long)0) +1);`
	`7`	`+ }`
	`8`	`+`
	`9`	`+longres =0;`
	`10`	`+for (longc :count.values()) {`
	`11`	`+res +=c * (c -1) /2;`
	`12`	`+ }`
	`13`	`+returnres;`
	`14`	`+ }`
	`15`	`+}`

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