Submission #1192781

#	Time	Username	Problem	Language	Result	Execution time	Memory
1192781		vnedu	즐거운 채소 기르기 (JOI14_growing)	C++17	30 / 100	12 ms	3212 KiB

growing

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

template<class T> bool maximize(T &a, const T &b){ return (a < b ? a = b, 1 : 0); }
template<class T> bool minimize(T &a, const T &b){ return (a > b ? a = b, 1 : 0); }

#define fi first
#define se second

#define pb push_back
#define ii pair<int, int>

#define all(x) x.begin(), x.end()

#define TASK "nonsense"

/// end of template ///

const int N = 3e5 + 10;
int n,a[N],bit[N];
vector<int> nen;
void add(int x, int val)
{
    x=n-x+1;
    while(x<=n)
    {
        bit[x]+=val;
        x+=x&-x;
    }
}
int get(int x)
{
    x=n-x+1;
    int ans=0;
    while(x>=1)
    {
        ans+=bit[x];
        x-=x&-x;
    }
    return ans;
}
ll p[N],s[N];
void solve()
{
    cin>>n;
    for(int i=1;i<=n;++i) cin>>a[i],nen.pb(a[i]);
    sort(all(nen));
    nen.erase(unique(all(nen)),nen.end());
    for(int i=1;i<=n;++i)
    {
        int x=lower_bound(all(nen),a[i])-nen.begin()+1;
        p[i]=p[i-1]+get(x+1);
        add(x,1);
    }
    memset(bit,0,sizeof(bit));
    for(int i=n;i>=1;--i)
    {
        int x=lower_bound(all(nen),a[i])-nen.begin()+1;
        s[i]=s[i+1]+get(x+1);
        add(x,1);
    }
    ll ans=LLONG_MAX;
    for(int i=0;i<=n;++i) minimize(ans,p[i]+s[i+1]);
    cout<<ans;
}
int main()  {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

//    freopen(TASK".inp","r",stdin);
//    freopen(TASK".out","w",stdout);

    int testcase=1;
//    cin>>testcase;

    while (testcase--)
        solve();

    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 0 / 15
• Subtask 4: 0 / 55