sumsuffix.go

package sumsuffix

func SumSuffix (s string) int {
	var r int
	for i := 0; i < len(s); i++ {
		suffix := s[i:]
		for j := 0; j < len(suffix); j++ {
			if s[j] != suffix[j] {
				break
			}
			r++
		}
	}
	return r
}

sumsuffix_test.go

package sumsuffix

import "testing"

var sumtests = []struct{
	input string
	expected int
}{
	{"ababaa", 11},
	{"aa", 3},
}

func TestSumSuffix (t *testing.T) {
	for _, test := range sumtests {
		if output := SumSuffix(test.input); output != test.expected {
			t.Fatalf("SumSuffix(%s) = %d, want %d",
				test.input, output, test.expected)
		}
	}
}

func BenchmarkSumSuffix (b *testing.B) {
	for i := 0; i < b.N; i++ {
		for _, test := range sumtests {
			SumSuffix(test.input)
		}
	}
}