Commit 02820c3

author

Shuo

authored

Merge pull request #669 from openset/develop

Add: Preimage Size of Factorial Zeroes Function

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+61

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Lines changed: 26 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1 +1,26 @@`
`1`		`-package preimage_size_of_factorial_zeroes_function`
	`1`	`+package problem_793`
	`2`	`+`
	`3`	`+func preimageSizeFZF(K int) int {`
	`4`	`+ l, r := 0, 5*(K+1)`
	`5`	`+ for l <= r {`
	`6`	`+ m := l + (r-l)/2`
	`7`	`+ km := zeros(m)`
	`8`	`+ if km < K {`
	`9`	`+ l = m + 1`
	`10`	`+ } else if km > K {`
	`11`	`+ r = m - 1`
	`12`	`+ } else {`
	`13`	`+ return 5`
	`14`	`+ }`
	`15`	`+ }`
	`16`	`+ return 0`
	`17`	`+}`
	`18`	`+`
	`19`	`+func zeros(x int) int {`
	`20`	`+ r := 0`
	`21`	`+ for x > 0 {`
	`22`	`+ r += x / 5`
	`23`	`+ x /= 5`
	`24`	`+ }`
	`25`	`+ return r`
	`26`	`+}`

Lines changed: 35 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1 +1,35 @@`
`1`		`-package preimage_size_of_factorial_zeroes_function`
	`1`	`+package problem_793`
	`2`	`+`
	`3`	`+import "testing"`
	`4`	`+`
	`5`	`+type caseType struct {`
	`6`	`+ input int`
	`7`	`+ expected int`
	`8`	`+}`
	`9`	`+`
	`10`	`+func TestPreimageSizeFZF(t *testing.T) {`
	`11`	`+ tests := [...]caseType{`
	`12`	`+ {`
	`13`	`+ input: 0,`
	`14`	`+ expected: 5,`
	`15`	`+ },`
	`16`	`+ {`
	`17`	`+ input: 5,`
	`18`	`+ expected: 0,`
	`19`	`+ },`
	`20`	`+ {`
	`21`	`+ input: 17,`
	`22`	`+ expected: 0,`
	`23`	`+ },`
	`24`	`+ {`
	`25`	`+ input: 11,`
	`26`	`+ expected: 0,`
	`27`	`+ },`
	`28`	`+ }`
	`29`	`+ for _, tc := range tests {`
	`30`	`+ output := preimageSizeFZF(tc.input)`
	`31`	`+ if output != tc.expected {`
	`32`	`+ t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)`
	`33`	`+ }`
	`34`	`+ }`
	`35`	`+}`

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