Submission #528818

#	Time	Username	Problem	Language	Result	Execution time	Memory
528818		andrei_boaca	Election (BOI18_election)	C++17	28 / 100	3080 ms	15376 KiB

election

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
int n,q;
string ss;
int v[500005];
vector<pii> qr[500005];
bool use[500005];
int sol[500005];
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n;
    cin>>ss;
    for(int i=0;i<n;i++)
    {
        if(ss[i]=='C')
            v[i+1]=1;
        else
            v[i+1]=-1;
    }
    cin>>q;
    for(int i=1;i<=q;i++)
    {
        int l,r;
        cin>>l>>r;
        qr[l].push_back({r,i});
    }
    deque<int> coada;
    for(int i=n;i>=1;i--)
    {
        if(v[i]==-1)
        {
            coada.push_front(i);
            use[i]=1;
        }
        else
        {
            //update(1,1,n,1,i,1);
            if(!coada.empty())
            {
                int poz=coada.front();
                use[poz]=0;
                //update(1,1,n,1,poz,-1);
                coada.pop_front();
            }
        }
        for(auto j:qr[i])
        {
            int poz=j.first,index=j.second;
            int minim=1e9,suma=0;
            int rez=0;
            for(int k=poz;k>=i;k--)
            {
                suma+=(!use[k])*v[k];
                minim=min(minim,suma);
                if(use[k])
                    rez++;
            }
            if(minim<0)
                rez+=abs(minim);
            sol[index]=rez;
        }
    }
    for(int i=1;i<=q;i++)
        cout<<sol[i]<<'\n';
    return 0;
}

• Subtask 1: 28 / 28
• Subtask 2: 0 / 54
• Subtask 3: 0 / 18