For problem statement at 0-999/400-499/490-499/491/problemB.txt this is a correct solution, but verifier at 0-999/400-499/490-499/491/verifierB.go ends with All tests passed. can you fix the verifier? package main

import (
	"bufio"
	"fmt"
	"os"
)

type FastScanner struct {
	r *bufio.Reader
}

func NewFastScanner() *FastScanner {
	return &FastScanner{r: bufio.NewReaderSize(os.Stdin, 1<<20)}
}

func (fs *FastScanner) NextInt64() int64 {
	var sign int64 = 1
	var val int64
	c, err := fs.r.ReadByte()
	for (c < '0' || c > '9') && c != '-' {
		c, err = fs.r.ReadByte()
		if err != nil {
			return 0
		}
	}
	if c == '-' {
		sign = -1
		c, _ = fs.r.ReadByte()
	}
	for c >= '0' && c <= '9' {
		val = val*10 + int64(c-'0')
		c, err = fs.r.ReadByte()
		if err != nil {
			break
		}
	}
	if err == nil {
		_ = fs.r.UnreadByte()
	}
	return val * sign
}

func max4(a, b, c, d int64) int64 {
	m := a
	if b > m {
		m = b
	}
	if c > m {
		m = c
	}
	if d > m {
		m = d
	}
	return m
}

func main() {
	in := NewFastScanner()
	out := bufio.NewWriterSize(os.Stdout, 1<<20)
	defer out.Flush()

	_ = in.NextInt64()
	_ = in.NextInt64()

	C := int(in.NextInt64())

	var minU, maxU, minV, maxV int64
	for i := 0; i < C; i++ {
		x := in.NextInt64()
		y := in.NextInt64()
		u := x + y
		v := x - y
		if i == 0 {
			minU, maxU, minV, maxV = u, u, v, v
		} else {
			if u < minU {
				minU = u
			}
			if u > maxU {
				maxU = u
			}
			if v < minV {
				minV = v
			}
			if v > maxV {
				maxV = v
			}
		}
	}

	H := int(in.NextInt64())
	bestDist := int64(1<<62 - 1)
	bestIdx := 1

	for i := 1; i <= H; i++ {
		x := in.NextInt64()
		y := in.NextInt64()
		u := x + y
		v := x - y
		d := max4(u-minU, maxU-u, v-minV, maxV-v)
		if d < bestDist {
			bestDist = d
			bestIdx = i
		}
	}

	fmt.Fprintln(out, bestDist)
	fmt.Fprintln(out, bestIdx)
}