[2200] CF1593G 括号前缀和

Author: EndlessCheng

main/1500-1599/1593G.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"bufio"
+	. "fmt"
+	"io"
+)
+
+// github.com/EndlessCheng/codeforces-go
+func CF1593G(_r io.Reader, _w io.Writer) {
+	in := bufio.NewReader(_r)
+	out := bufio.NewWriter(_w)
+	defer out.Flush()
+	abs := func(x int) int {
+		if x < 0 {
+			return -x
+		}
+		return x
+	}
+
+	var T, q, l, r int
+	var s string
+	for Fscan(in, &T); T > 0; T-- {
+		Fscan(in, &s, &q)
+		sum := make([]int, len(s)+1)
+		for i, b := range s {
+			sum[i+1] = sum[i]
+			if b < 42 {
+				sum[i+1] += i&1<<1 - 1
+			}
+		}
+		for ; q > 0; q-- {
+			Fscan(in, &l, &r)
+			Fprintln(out, abs(sum[r]-sum[l-1]))
+		}
+	}
+}
+
+//func main() { CF1593G(os.Stdin, os.Stdout) }

main/1500-1599/1593G_test.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"github.com/EndlessCheng/codeforces-go/main/testutil"
+	"testing"
+)
+
+// https://codeforces.com/problemset/problem/1593/G
+// https://codeforces.com/problemset/status/1593/problem/G
+func TestCF1593G(t *testing.T) {
+	// just copy from website
+	rawText := `
+inputCopy
+3
+([))[)()][]]
+3
+1 12
+4 9
+3 6
+))))))
+2
+2 3
+1 4
+[]
+1
+1 2
+outputCopy
+0
+2
+1
+0
+0
+0`
+	testutil.AssertEqualCase(t, rawText, 0, CF1593G)
+}