Commit 5156f8d

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update: thow overflow

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Original file line number	Diff line number	Diff line change
`@@ -8,6 +8,7 @@ class TwoStacks {`
`8`	`8`	`this.data = [];`
`9`	`9`	`this.top1 = -1;`
`10`	`10`	`this.top2 = capacity;`
	`11`	`+ this.overflow = new Error('Overflow: Stack is full');`
`11`	`12`
`12`	`13`	`this.capacity = capacity;`
`13`	`14`	`}`
`@@ -16,13 +17,17 @@ class TwoStacks {`
`16`	`17`	`if (this.top1 < this.top2 - 1) {`
`17`	`18`	`this.top1 += 1;`
`18`	`19`	`this.data[this.top1] = value;`
	`20`	`+ } else {`
	`21`	`+ throw this.overflow;`
`19`	`22`	`}`
`20`	`23`	`}`
`21`	`24`
`22`	`25`	`push2(value) {`
`23`	`26`	`if (this.top1 < this.top2 - 1) {`
`24`	`27`	`this.top2 -= 1;`
`25`	`28`	`this.data[this.top2] = value;`
	`29`	`+ } else {`
	`30`	`+ throw this.overflow;`
`26`	`31`	`}`
`27`	`32`	`}`
`28`	`33`

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