Submission #1125

#	Time	Username	Problem	Language	Result	Execution time	Memory
1125		ainta	공장 (KOI13_factory)	C++98	20 / 20	262 ms	8696 KiB

factory

#include<stdio.h>
int N,ord[1000001],BIT[500010],i,w[500010];
long long Res;
int Sum(int a){
int s=0;
while(a){
s+=BIT[a];
a=a&(a-1);
}
return s;
}
void add(int a){
while(a<=N){
BIT[a]++;
a=2*a-(a&(a-1));
}
}
int main()
{
int a;
scanf("%d",&N);
for(i=1;i<=N;i++){
scanf("%d",&a);
ord[a]=i;
}
for(i=1;i<=N;i++){
scanf("%d",&a);
w[ord[a]]=i;
}
for(i=1;i<=N;i++){
add(w[i]);
Res=Res+w[i]-Sum(w[i]);
}
printf("%lld\n",Res);
}

• Subtask 1: 2.2 / 2.2
• Subtask 2: 3.4 / 3.4
• Subtask 3: 3.8 / 3.8
• Subtask 4: 4.8 / 4.8
• Subtask 5: 5.8 / 5.8