Commit 186d384

author

Shuo

authored

Merge pull request #784 from openset/develop

A: Longest Valid Parentheses

2 parents 973fa7f + df037eb commit 186d384Copy full SHA for 186d384

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Lines changed: 1 addition & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -27,6 +27,7 @@ var problemStatus = map[int]bool{`
`27`	`27`	`26: true,`
`28`	`28`	`27: true,`
`29`	`29`	`28: true,`
	`30`	`+ 32: true,`
`30`	`31`	`35: true,`
`31`	`32`	`36: true,`
`32`	`33`	`38: true,`

Lines changed: 25 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,26 @@`
`1`	`1`	`package problem32`
	`2`	`+`
	`3`	`+func longestValidParentheses(s string) int {`
	`4`	`+ ans, l := 0, len(s)`
	`5`	`+ dp := make([]int, l)`
	`6`	`+ for i, c := range s {`
	`7`	`+ if i == 0 \|\| c == '(' {`
	`8`	`+ continue`
	`9`	`+ }`
	`10`	`+ if s[i-1] == '(' {`
	`11`	`+ dp[i] = 2`
	`12`	`+ if i > 1 {`
	`13`	`+ dp[i] += dp[i-2]`
	`14`	`+ }`
	`15`	`+ } else if i > dp[i-1] && s[i-1-dp[i-1]] == '(' {`
	`16`	`+ dp[i] = dp[i-1] + 2`
	`17`	`+ if i-1 > dp[i-1] {`
	`18`	`+ dp[i] += dp[i-2-dp[i-1]]`
	`19`	`+ }`
	`20`	`+ }`
	`21`	`+ if dp[i] > ans {`
	`22`	`+ ans = dp[i]`
	`23`	`+ }`
	`24`	`+ }`
	`25`	`+ return ans`
	`26`	`+}`

Lines changed: 34 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,35 @@`
`1`	`1`	`package problem32`
	`2`	`+`
	`3`	`+import "testing"`
	`4`	`+`
	`5`	`+type testType struct {`
	`6`	`+ in string`
	`7`	`+ want int`
	`8`	`+}`
	`9`	`+`
	`10`	`+func TestLongestValidParentheses(t *testing.T) {`
	`11`	`+ tests := [...]testType{`
	`12`	`+ {`
	`13`	`+ in: "(()",`
	`14`	`+ want: 2,`
	`15`	`+ },`
	`16`	`+ {`
	`17`	`+ in: ")()())",`
	`18`	`+ want: 4,`
	`19`	`+ },`
	`20`	`+ {`
	`21`	`+ in: ")()())(())()(",`
	`22`	`+ want: 6,`
	`23`	`+ },`
	`24`	`+ {`
	`25`	`+ in: "()(())",`
	`26`	`+ want: 6,`
	`27`	`+ },`
	`28`	`+ }`
	`29`	`+ for _, tt := range tests {`
	`30`	`+ got := longestValidParentheses(tt.in)`
	`31`	`+ if got != tt.want {`
	`32`	`+ t.Fatalf("in: %v, got: %v, want: %v", tt.in, got, tt.want)`
	`33`	`+ }`
	`34`	`+ }`
	`35`	`+}`

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