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add missing package

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Edward 2020-05-06 17:23:37 +08:00
parent e8bf182160
commit 284a608419
1 changed files with 13 additions and 12 deletions
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25
profiling/profile.go
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@ -1,25 +1,26 @@
package profile
import (
"time"
"log"
"log"
"math/big"
"time"
)
func Duration(invocation time.Time, name string) {
elapsed := time.Since(invocation)
elapsed := time.Since(invocation)
log.Printf("%s lasted %s", name, elapsed)
log.Printf("%s lasted %s", name, elapsed)
}
func BigIntFactorial(x big.Int) *big.Int {
// Arguments to a defer statement is immediately evaluated and stored.
// The deferred function receives the pre-evaluated values when its invoked.
defer Duration(time.Now(), "IntFactorial")
// Arguments to a defer statement is immediately evaluated and stored.
// The deferred function receives the pre-evaluated values when its invoked.
defer Duration(time.Now(), "IntFactorial")
y := big.NewInt(1)
for one := big.NewInt(1); x.Sign() > 0; x.Sub(x, one) {
y.Mul(y, x)
}
y := big.NewInt(1)
for one := big.NewInt(1); x.Sign() > 0; x.Sub(x, one) {
y.Mul(y, x)
}
return x.Set(y)
return x.Set(y)
}