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1392c.go
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1392c.go
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// 00
package main
import (
"bufio"
"fmt"
"os"
)
func write(f *bufio.Writer, a ...interface{}) {
f.Write([]byte(fmt.Sprint(a...)))
}
type Number interface {
int64 | float64 | int
}
func min[K Number](a K, b K) K {
if a < b {
return a
}
return b
}
func max[K Number](a K, b K) K {
if a > b {
return a
}
return b
}
func main() {
var T int
reader := bufio.NewReader(os.Stdin)
f := bufio.NewWriter(os.Stdout)
defer f.Flush()
fmt.Fscan(reader, &T)
for t := 1; t <= T; t++ {
var n int
fmt.Fscan(reader, &n)
a := make([]int, n)
mx := make([]int, n)
for i := 0; i < n; i++ {
fmt.Fscan(reader, &a[i])
if i == 0 {
mx[i] = a[i]
} else {
if mx[i-1] < a[i] {
mx[i] = a[i]
} else {
mx[i] = mx[i-1]
}
}
}
ans := int64(0)
i := 0
for i < n {
start := mx[i]
for mx[i] == start {
if i == 0 {
i++
} else {
if a[i] < a[i-1] {
ans += int64(a[i-1] - a[i])
}
i++
}
if i == n {
break
}
}
}
write(f, ans, "\n")
}
}