Submission #311812

#	Time	Username	Problem	Language	Result	Execution time	Memory
311812		lukameladze	Interval Collection (CCO20_day2problem2)	C++14	25 / 25	4892 ms	286456 KiB

Main

# include <bits/stdc++.h>
using namespace std;
# define mnri first.second
#define mxle  first.first
pair <pair <long long, long long> , long long>  tree[4000005];
long long  x,l,r,le1,ri1,ans,q,mnr,mxl,mx=1000005;
char ch;
multiset<long long>::iterator it;
multiset< long long> le,ri,ms1[1000005],ms2[1000005];
void update(long long node, long long le, long long ri, long long idx, long long val, int ty)
{
    
    if (le>idx || ri<idx) return;
    if (le==ri)
    {
        if (ty==0)
        {
            tree[node].mnri=val;
        }
        else tree[node].mxle=val;
        tree[node].second=tree[node].mnri-tree[node].mxle;
        //cout<<node<<" "<<idx<<" "<<le<<" "<<ri<<" ";
       // cout<<tree[node].second<<" "<<tree[node].mnri<<" "<<tree[node].mxle<<endl;
        return;
    }
    long long mid=(le+ri)/2;
    update(2*node,le,mid,idx,val, ty);
    update(2*node+1, mid+1, ri, idx, val, ty);
    tree[node].mnri=min(tree[2*node].mnri, tree[2*node+1].mnri);
    tree[node].mxle=max(tree[2*node].mxle, tree[2*node+1].mxle);
    x=min(tree[2*node].second, tree[2*node+1].second);
    tree[node].second=min(x,tree[2*node+1].mnri-tree[2*node].mxle);
}
int main()
{
    cin>>q;
    for (long long i=1; i<=4*1000005; i++)
    {
        tree[i].mnri=1e9;
        tree[i].mxle=-1e9;
        tree[i].second=2e9;
    }
    while (q--)
    {
        cin>>ch>>l>>r;
        if (ch=='R')
        {
            le.erase(le.find(l));
            ri.erase(ri.find(r));
            ms1[l].erase(ms1[l].find(r));
            ms2[r].erase(ms2[r].find(l));
            if (!ms1[l].size()) ms1[l].insert(1e9);
            if (!ms2[r].size()) ms2[r].insert(-1e9);
            mnr=*ms1[l].begin();
            update(1,1,mx,l,mnr,0);
            
                it=ms2[r].end();
                it--;
            mxl=*it;
            //cout<<r<<" "<<mxl<<endl;
            update(1,1,mx,r,mxl,1);
        }
        else
        {
            ms1[l].insert(r);
            ms2[r].insert(l);
            //cout<<l<<endl<<endl;
            le.insert(l);
            ri.insert(r);
            mnr=*ms1[l].begin();
            it=ms2[r].end();
            it--;
            mxl=*it;
           // cout<<l<<" "<<mnr<<" "<<r<<" "<<mxl<<endl;
            update(1,1,mx,l,mnr,0);
           // cout<<endl<<endl;
            update(1,1,mx,r,mxl,1);
        }
        //if (l==6)
        //{
         //   for (multiset<long long>::iterator it=le.begin(); it!=le.end(); it++)
           // cout<<*it<<" ";
            //cout<<endl<<endl;
       // }
       // cout<<*(--le.end())<<" max"<<endl;
       it=le.end();
       it--;
        mxl=*it;
        mnr=*(ri.begin());
       // cout<<mnr<<" "<<mxl<<endl;
        if (mnr<=mxl)
        {
           //cout<<"s"<<endl;
            cout<<tree[1].second<<endl;//<<"  "<<tree[1].mnri<<" "<<tree[1].mxle<<endl;
        }
        else
        {
            ri1=*(ms1[mxl].begin());
            it=ms2[mnr].end();
            it--;
            le1=*it;
            cout<<ri1-le1<<endl;
        }
    }
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:39:21: warning: iteration 4000004 invokes undefined behavior [-Waggressive-loop-optimizations]
   39 |         tree[i].mnri=1e9;
      |         ~~~~~~~~~~~~^~~~
Main.cpp:37:26: note: within this loop
   37 |     for (long long i=1; i<=4*1000005; i++)
      |                         ~^~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 8 / 8
• Subtask 3: 7 / 7
• Subtask 4: 4 / 4
• Subtask 5: 3 / 3