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cal.go
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cal.go
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package cal
import (
"fmt"
"strconv"
"strings"
"github.com/catorpilor/leetcode/utils"
)
func Calculate(input string) int {
var ret int
input = strings.Replace(input, " ", "", -1)
st1 := utils.NewStack()
var highOp string
bp, ep := len(input), len(input)
ended := true
for i := 0; i < len(input); i++ {
switch input[i] {
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
if ended {
bp = i
ended = false
}
ep = i + 1
if ep >= len(input) {
st1.Push(input[bp:])
}
case '*', '/', '+', '-':
ended = true
var op2 string
if ep >= len(input) {
op2 = input[bp:]
} else {
op2 = input[bp:ep]
}
var higherOp bool
ops := string(input[i])
if ops == "*" || ops == "/" {
higherOp = true
}
highOp = cal(st1, ops, highOp, op2, higherOp)
// st1.Push(input[bp:ep])
if higherOp {
highOp = ops
} else {
st1.Push(ops)
}
}
}
fmt.Printf("stack1: %s\n", st1.String())
// fmt.Printf("stack2: %s\n", st2.String())
if highOp != "" {
op2, _ := strconv.Atoi(st1.Pop().(string))
// op := st2.Pop().(string)
op1, _ := strconv.Atoi(st1.Pop().(string))
switch highOp {
case "*":
ret = op1 * op2
case "/":
ret = op1 / op2
}
highOp = ""
st1.Push(strconv.Itoa(ret))
}
for st1.Len() >= 3 {
op2, _ := strconv.Atoi(st1.Pop().(string))
op := st1.Pop().(string)
op1, _ := strconv.Atoi(st1.Pop().(string))
switch op {
case "+":
st1.Push(strconv.Itoa(op1 + op2))
case "-":
st1.Push(strconv.Itoa(op1 - op2))
}
fmt.Printf("st1 now: %s\n", st1.String())
}
if st1.Len() == 1 {
ret, _ = strconv.Atoi(st1.Pop().(string))
}
return ret
}
func cal(st1 *utils.Stack, op, prevOp, op2 string, higherOp bool) string {
fmt.Printf("stack1 is %s, op is %s, prevOp is %s, op2 is %s and flag is %t\n",
st1.String(), op, prevOp, op2, higherOp)
// if !st2.IsEmpty() {
if prevOp != "" {
oprand2, _ := strconv.Atoi(op2)
oprand1, _ := strconv.Atoi(st1.Pop().(string))
var res int
// op := st2.Pop().(string)
switch prevOp {
case "*":
res = oprand1 * oprand2
case "/":
res = oprand1 / oprand2
}
prevOp = ""
st1.Push(strconv.Itoa(res))
} else {
st1.Push(op2)
}
if !higherOp {
if st1.Len() == 3 {
op2, _ := strconv.Atoi(st1.Pop().(string))
op := st1.Pop().(string)
op1, _ := strconv.Atoi(st1.Pop().(string))
switch op {
case "+":
st1.Push(strconv.Itoa(op1 + op2))
case "-":
st1.Push(strconv.Itoa(op1 - op2))
}
}
}
return prevOp
}
/*
curInde: 0, num: 1, lastSign: +, sum: 0, tempSum: 0
curInde: 1, num: 1, lastSign: +, sum: 0, tempSum: 0
curInde: 2, num: 2, lastSign: *, sum: 0, tempSum: 1
curInde: 3, num: 2, lastSign: *, sum: 0, tempSum: 1
curInde: 4, num: 3, lastSign: -, sum: 0, tempSum: 2
curInde: 5, num: 3, lastSign: -, sum: 0, tempSum: 2
curInde: 6, num: 4, lastSign: /, sum: 2, tempSum: -3
curInde: 7, num: 4, lastSign: /, sum: 2, tempSum: -3
curInde: 8, num: 5, lastSign: +, sum: 2, tempSum: 0
curInde: 9, num: 5, lastSign: +, sum: 2, tempSum: 0
curInde: 10, num: 6, lastSign: *, sum: 2, tempSum: 5
curInde: 11, num: 6, lastSign: *, sum: 2, tempSum: 5
curInde: 12, num: 7, lastSign: -, sum: 2, tempSum: 30
curInde: 13, num: 7, lastSign: -, sum: 2, tempSum: 30
curInde: 14, num: 8, lastSign: *, sum: 32, tempSum: -7
curInde: 15, num: 8, lastSign: *, sum: 32, tempSum: -7
curInde: 16, num: 9, lastSign: +, sum: 32, tempSum: -56
curInde: 17, num: 9, lastSign: +, sum: 32, tempSum: -56
curInde: 18, num: 1, lastSign: /, sum: -24, tempSum: 9
curInde: 19, num: 10, lastSign: /, sum: -24, tempSum: 9
*/
func Calculate2(s string) int {
s = strings.Replace(s, " ", "", -1)
var sum, tempSum, num int
lastSign := byte('+')
for i := 0; i < len(s); i++ {
// fmt.Printf("curInde: %d, num: %d, ")
if s[i] >= '0' && s[i] <= '9' {
num = num*10 + int(s[i]-'0')
}
if i == len(s)-1 || s[i] < '0' || s[i] > '9' {
switch lastSign {
case '+':
sum += tempSum
tempSum = num
case '-':
sum += tempSum
tempSum = -num
case '*':
tempSum *= num
case '/':
tempSum /= num
}
lastSign = s[i]
num = 0
}
fmt.Printf("curInde: %d, num: %d, lastSign: %s, sum: %d, tempSum: %d\n",
i, num, string(lastSign), sum, tempSum)
}
sum += tempSum
return sum
}