Submission #16292

#	Time	Username	Problem	Language	Result	Execution time	Memory
16292		khsoo01	전봇대 (KOI13_pole)	C++98	100 / 100	38 ms	1864 KiB

pole

#include<cstdio>
#define abs(X)(X>0?X:-(X))
#define ll long long
ll n,a[100005],t,p,ans,mn=1e18;

void binSrch(ll x,ll y)
{
    if(x==y)return;
    ll pivot=(x+y)/2,d=0,q=0;
    for(ll i=0;i<n;i++) {
        if(i*pivot<a[i])d+=i;
        if(i*pivot>a[i])d-=i;
        q+=abs(pivot*i-a[i]);
    }
    if(q<mn)mn=q;
    if(d<0)binSrch(x,pivot);
    if(d>0)binSrch(pivot+1,y);
}
int main()
{
    ll i;
    scanf("%d",&n);
    scanf("%d",&a[0]);
    t=a[0];
    a[0]=0;
    for(i=1;i<n;i++) {
        scanf("%d",&a[i]);
        a[i]-=t;
    }
    binSrch(0,1000000001);
    printf("%lld",mn);
}

• Subtask 1: 11 / 11
• Subtask 2: 21 / 21
• Subtask 3: 31 / 31
• Subtask 4: 37 / 37