Submission #1050918

#	Time	Username	Problem	Language	Result	Execution time	Memory
1050918		Dennis_Jason	Sails (IOI07_sails)	C++14	100 / 100	85 ms	10092 KiB

sails

#include <bits/stdc++.h>
#define NMAX 250001
#define int long long

#define pb push_back
#define eb emplace_back
#define MOD 1000000007
#define nl '\n'
#define INF  1000000007
#define LLONG_MAX 9223372036854775807
#define pii pair<int,int>
#define tpl tuple<int,int,int,int>
#pragma GCC optimize("O3")
using namespace std;
ifstream fin("aib.in");
ofstream fout("aib.out");
int MAX=100000;
vector<int>delta;
class segtree{
private:
    int n;
    vector<int>before;
    vector<int>after;

public:
    void init(int sz)
    {
        n=sz+1;
        before.resize(4*sz+1,-1);
        after.resize(4*sz+1,-1);
        update(0,MAX+1);
    }
    void update(int node,int st,int dr,int pos,int val)
    {
        if(st>pos || dr<=pos)
            return;
        if(st+1==dr)
        {
            delta[st]+=val;
            if(delta[st])
                before[node]=after[node]=pos;
            else
                before[node]=after[node]=-1;
            return;
        }
        int mid=(st+dr)/2;
            update(2*node,st,mid,pos,val);
            update(2*node+1,mid,dr,pos,val);
        before[node]=(before[2*node+1]!=-1? before[2*node+1]:before[2*node]);
        after[node]=(after[2*node]!=-1? after[2*node]:after[2*node+1]);
    }

    int first_after(int node,int st,int dr,int L,int R)
    {
        if(st>=R || dr<=L)
            return -1;
        if(L<=st && dr<=R)
        {
            return after[node];
        }
        int mid=(st+dr)/2;
        int left=first_after(2*node,st,mid,L,R);
        int right=first_after(2*node+1,mid,dr,L,R);
        int ans=(left!=-1? left:right);
        return ans;
    }
    int last_before(int node,int st,int dr,int L,int R)
    {
        if(st>=R || dr<=L)
            return -1;
        if(L<=st && dr<=R)
        {
            return before[node];
        }
        int mid=(st+dr)/2;
        int left=last_before(2*node,st,mid,L,R);
        int right=last_before(2*node+1,mid,dr,L,R);
        int ans=(right!=-1? right:left);
        return ans;
    }

    void update(int pos,int val)
    {
        update(1,0,MAX+1,pos,val);
    }
    int first(int L,int R)
    {
        return first_after(1,0,MAX+1,L,R);
    }
    int last(int L,int R)
    {
        return last_before(1,0,MAX+1,L,R);
    }
};
int n,max_h;
vector<pii>v;
segtree st;
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin>>n;
    v.resize(n);
    for(int i=0;i<n;++i)
    {
        cin>>v[i].first>>v[i].second;
        max_h=max(max_h,v[i].first);
    }
    delta.resize(MAX);
    st.init(MAX);

    auto cmp=[&](pii a,pii b)
    {
//        if(a.first==b.first)
//            return a.second<b.second;
        return a.first<b.first;
    };
    sort(v.begin(),v.end());
    for(int i=0;i<n;++i)
    {
        int h0=v[i].first-v[i].second;
        int up=st.first(h0,MAX+1);
        int down=st.last(0,h0+1);
        if(up==-1)
            up=v[i].first;
        /*------------------DEBUG--------------------

        cout<<v[i].first<<" "<<v[i].second<<": "<<nl;
        cout<<"h0  0-h0+1 h0-maxh+1"<<nl;
        cout<<h0<<" --- "<<down<<" --- "<<up<<nl<<nl;

        ------------------------------------------*/
        st.update(v[i].first,1);
        st.update(up,-1);
        st.update(down+up-h0,1);
        st.update(down,-1);
//        for(int i=1;i<=max_h;++i)
//        {
//            cout<<delta[i]<<" ";
//        }
//        cout<<nl;
    }
    int ans=0,aux=0;
    for(int i=MAX;i>0;--i)
    {
//        cout<<delta[i]<<" ";
        aux+=delta[i];
        ans+=(aux*(aux-1))/2;
    }
    cout<<ans;




    return 0;
}

Compilation message (stderr)

sails.cpp:10: warning: "LLONG_MAX" redefined
   10 | #define LLONG_MAX 9223372036854775807
      | 
In file included from /usr/lib/gcc/x86_64-linux-gnu/10/include/limits.h:195,
                 from /usr/lib/gcc/x86_64-linux-gnu/10/include/syslimits.h:7,
                 from /usr/lib/gcc/x86_64-linux-gnu/10/include/limits.h:34,
                 from /usr/include/c++/10/climits:42,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:39,
                 from sails.cpp:1:
/usr/include/limits.h:135: note: this is the location of the previous definition
  135 | #  define LLONG_MAX __LONG_LONG_MAX__
      | 
sails.cpp: In function 'int main()':
sails.cpp:113:10: warning: variable 'cmp' set but not used [-Wunused-but-set-variable]
  113 |     auto cmp=[&](pii a,pii b)
      |          ^~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10