AcWing 第 31 场周赛

Author: EndlessCheng

misc/acwing/weekly/31/a/a.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	. "fmt"
+	"io"
+	"os"
+)
+
+// github.com/EndlessCheng/codeforces-go
+func run(in io.Reader, out io.Writer) {
+	var v, l, r, ans int
+	x := int(1e9)
+	for i := 0; i < 4; i++ {
+		Fscan(in, &v)
+		x = min(x, v)
+	}
+	Fscan(in, &l, &r)
+	r = min(r, x-1)
+	if r >= l {
+		ans = r - l + 1
+	}
+	Fprint(out, ans)
+}
+
+func main() { run(os.Stdin, os.Stdout) }
+
+func min(a, b int) int {
+	if a > b {
+		return b
+	}
+	return a
+}

misc/acwing/weekly/31/a/a_test.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	. "fmt"
+	"io"
+	"os"
+	"strconv"
+)
+
+// github.com/EndlessCheng/codeforces-go
+func run(in io.Reader, out io.Writer) {
+	var s []byte
+	Fscan(in, &s)
+	for i, b := range s {
+		if b > '1' {
+			for ; i < len(s); i++ {
+				s[i] = '1'
+			}
+			break
+		}
+	}
+	v, _ := strconv.ParseInt(string(s), 2, 64)
+	Fprint(out, v)
+}
+
+func main() { run(os.Stdin, os.Stdout) }

misc/acwing/weekly/31/b/b.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"bufio"
+	. "fmt"
+	"io"
+	"math/bits"
+	"os"
+)
+
+// github.com/EndlessCheng/codeforces-go
+const _w = bits.UintSize
+func NewBitset(n int) Bitset { return make(Bitset, n/_w+1) } // (n+_w-1)/_w
+type Bitset []uint
+func (b Bitset) Set(p int) { b[p/_w] |= 1 << (p % _w) }
+
+func run(_r io.Reader, _w io.Writer) {
+	in := bufio.NewReader(_r)
+	out := bufio.NewWriter(_w)
+	defer out.Flush()
+
+	var n, m, k, v, w int
+	Fscan(in, &n, &m, &k)
+	ps := make([]struct{ x, y int }, n)
+	for i := range ps {
+		Fscan(in, &ps[i].x, &ps[i].y)
+	}
+	cs := make([]struct{ x, y, r int }, m)
+	for i := range cs {
+		Fscan(in, &cs[i].r, &cs[i].x, &cs[i].y)
+	}
+	bs := make([]Bitset, n)
+	for i, p := range ps {
+		bs[i] = NewBitset(m)
+		for j, c := range cs {
+			if (p.x-c.x)*(p.x-c.x)+(p.y-c.y)*(p.y-c.y) <= c.r*c.r {
+				bs[i].Set(j)
+			}
+		}
+	}
+	for ; k > 0; k-- {
+		Fscan(in, &v, &w)
+		s := 0
+		for i, x := range bs[v-1] {
+			s += bits.OnesCount(x ^ bs[w-1][i])
+		}
+		Fprintln(out, s)
+	}
+}
+
+func main() { run(os.Stdin, os.Stdout) }