【华为OD机试真题】9、绘图机器

package main

import (
	"fmt"
	"math"
)

type point struct {
	x int
	y int
}

func main() {
	var n, e int
	fmt.Scan(&n, &e)
	inputList := make(map[int]int, n)
	for i := 0; i < n; i++ {
		var x, offsetY int
		fmt.Scan(&x, &offsetY)
		inputList[x] = offsetY
	}

	prevX := 0
	prevY := 0
	area := 0
	//不全全部点的Y数值
	for x, offsetY := range inputList {
		wight := x - prevX
		height := int(math.Abs(float64(prevY)))
		area += wight * height

		prevX = x
		prevY += offsetY
	}

	if prevX < e {
		area += (e - prevX) * int(math.Abs(float64(prevY)))
	}

	fmt.Println(area)

}

总结：题目中纵坐标是偏移量，需要用上一个点的y加上当前的偏移量才是下一个点的y.