Submission #16238

#	Time	Username	Problem	Language	Result	Execution time	Memory
16238		eaststar	공장 (KOI13_factory)	C++14	20 / 20	258 ms	6944 KiB

factory

#include <cstdio>
int a[1000010],bit[500010];
long long int s;
int getsum(int k){
    int sum=0;
    while(k){
        sum+=bit[k];
        k-=k&-k;
    }
    return sum;
}
void update(int k,int e,int v){
    while(k<=e){
        bit[k]+=v;
        k+=k&-k;
    }
}
int main(){
    int i,n,k;
    scanf("%d",&n);
    for(i=1;i<=n;++i)scanf("%d",&k),a[k]=i;
    for(i=1;i<=n;++i){
        scanf("%d",&k);
        update(a[k],n,1);
        s+=getsum(n)-getsum(a[k]);
    }
    printf("%lld",s);
    return 0;
}

• 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