已AC,但是:
#include<cstdio>
int main(){
int n,ans=1;
scanf("%d",&n);
while(n--){
ans++;
ans*=2;
}
printf("%d",ans);
return 0;
}
就是错的,而
#include<cstdio>
int main(){
int n,ans=1;
scanf("%d",&n);
while(--n){
ans++;
ans*=2;
}
printf("%d",ans);
return 0;
}
就对了,请大佬解答