Submission #878018

#	Time	Username	Problem	Language	Result	Execution time	Memory
878018		hmuhmuhmu	Safety (NOI18_safety)	C++14	40 / 100	275 ms	1180 KiB

safety

#include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define ll long long
#define ldb long double
#define db double
#define fin(x) freopen(x,"r",stdin)
#define fout(x) freopen(x,"w",stdout)
#define fo(i,l,r) for(int i=(l);i<=(r);i++)
#define foi(i,l,r) for(int i=(l);i>=(r);i--)
#define el cout<<'\n';
#define cel cerr<<'\n';
#define all(x) x.begin(),x.end()
#define ii pair<int,int>
#define iii pair<int,ii>
#define gb(x,i) (((x)>>(i))&1)
#define mask(i) (1LL<<(i))
using namespace std;
const int N=2e5+5;
const int bl=60;
const ll base=1e9+7;
const ll inf=1e9;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
ll Rand(ll l,ll r)
{
    return l+(1ll*rng()*rng()%(r-l+1)+(r-l+1))%(r-l+1);
}
template<class X,class Y>bool maximize(X &a,Y b)
{
    if(a<b) return a=b,true;
    return false;
}
template<class X,class Y>bool minimize(X &a, Y b)
{
    if(a>b) return a=b,true;
    return false;
}
void add(auto &a,auto b)
{
    a+=b;
    if(a>=base) a-=base;
    if(a<0) a+=base;
}
int n,diff,h[N];
namespace sub12567
{
    ll dp[N],f[N];
    deque<int>dq;
    void solve()
    {
        fo(i,1,n)
        {
            fo(j,0,5e3) f[j]=1e18;
            dq.clear();
            fo(j,0,5e3)
            {
                while(dq.size() and dp[dq.back()]>=dp[j]) dq.pop_back();
                dq.pb(j);
                while(j-dq.front()>diff) dq.pop_front();
                minimize(f[j],dp[dq.front()]);
            }
            dq.clear();
            foi(j,5e3,0)
            {
                while(dq.size() and dp[dq.back()]>=dp[j]) dq.pop_back();
                dq.pb(j);
                while(dq.front()-j>diff) dq.pop_front();
                minimize(f[j],dp[dq.front()]),f[j]+=abs(h[i]-j);
            }
            fo(j,0,5e3) dp[j]=f[j];
        }
        ll ans=1e18;
        fo(i,0,5e3) minimize(ans,dp[i]);
        cout<<ans;
    }
}
int main()
{
    #define task "o"
    if(fopen(task".inp","r"))
    {
        fin(task".inp");
        //fout(task".out");
    }
    srand(time(NULL));
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin>>n>>diff;
    fo(i,1,n) cin>>h[i];
    if(n<=5e3)
    {
        sub12567::solve();
        return 0;
    }
    if(!diff)
    {
        sort(h+1,h+n+1);
        int x=h[(n+1)/2];
        ll ans=0;
        fo(i,1,n) ans+=abs(h[i]-x);
        return cout<<ans,0;
    }
}

Compilation message (stderr)

safety.cpp:40:10: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   40 | void add(auto &a,auto b)
      |          ^~~~
safety.cpp:40:18: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   40 | void add(auto &a,auto b)
      |                  ^~~~
safety.cpp: In function 'int main()':
safety.cpp:9:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 | #define fin(x) freopen(x,"r",stdin)
      |                ~~~~~~~^~~~~~~~~~~~~
safety.cpp:84:9: note: in expansion of macro 'fin'
   84 |         fin(task".inp");
      |         ^~~

• Subtask 1: 3 / 3
• Subtask 2: 4 / 4
• Subtask 3: 0 / 9
• Subtask 4: 5 / 5
• Subtask 5: 6 / 6
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 0 / 22
• Subtask 9: 0 / 29