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Find no of patterns in given string
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func findOccurrencesOfSubstrings(input string, pattern string) int { | |
if len(input) == 0 || len(pattern) == 0 { | |
return 0 | |
} | |
charPatternArray := []rune(pattern) | |
charInputArray := []rune(input) | |
patternCharTable := getLookupTable(charPatternArray) | |
inputCharTable := getLookupTable(charInputArray) | |
inputSum := 0 | |
patternSum := 0 | |
for _, value := range charPatternArray { | |
patternSum += patternCharTable[value] | |
inputSum += inputCharTable[value] | |
} | |
return inputSum / patternSum | |
} | |
func getLookupTable(charArray []rune) [256]int { | |
charTable := [256]int{} | |
for _, value := range charArray { | |
charTable[value] = charTable[value] + 1 | |
} | |
return charTable | |
} | |
func Test_findOccurrencesOfSubstrings(t *testing.T) { | |
type args struct { | |
input string | |
pattern string | |
} | |
tests := []struct { | |
name string | |
args args | |
want int | |
}{ | |
{name: "Case 1", args: args{input: "aAbBnlloknoaAbBnllokno", pattern: "Balloon"}, want: 2}, | |
{name: "Case 2", args: args{input: "aAbBnlloknoaAbBnlloknoBalloon", pattern: "Balloon"}, want: 3}, | |
{name: "Case 3", args: args{input: "aAbBnlloknoaAbBnlloknoBalloonBall", pattern: "Balloon"}, want: 3}, | |
{name: "Case 4", args: args{input: "Balloon", pattern: "Balloon"}, want: 1}, | |
{name: "Case 5", args: args{input: "xyzxyzxyzxyzBalloonxyz", pattern: "Balloon"}, want: 1}, | |
{name: "Case 6", args: args{input: "", pattern: "Balloon"}, want: 0}, | |
{name: "Case 7", args: args{input: "xyzxyzxyzxyzBalloonxyz", pattern: ""}, want: 0}, | |
{name: "Case 8", args: args{input: "xyzabc", pattern: "pqr"}}, | |
{name: "Case 9", args: args{input: "dhimanman", pattern: "man"}, want: 2}, | |
{name: "Case 10", args: args{input: "Banana", pattern: "nn"}, want: 1}, | |
{name: "Case 11", args: args{input: "aaaaa", pattern: "aa"}, want: 2}, | |
} | |
for _, tt := range tests { | |
t.Run(tt.name, func(t *testing.T) { | |
if got := findOccurrencesOfSubstrings(tt.args.input, tt.args.pattern); got != tt.want { | |
t.Errorf("findOccurrencesOfSubstrings() = %v, want %v", got, tt.want) | |
} | |
}) | |
} | |
} |
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