Submission #68569

#	Time	Username	Problem	Language	Result	Execution time	Memory
68569		renatsj	Election (BOI18_election)	C++14	28 / 100	3013 ms	1936 KiB

election

#include<bits/stdc++.h>
using namespace std;
int i,j,n,m,l,r,mas[500005],a[2],rez;
vector<int> k;
vector<int>::iterator it;
char c;
int main()
{
    cin.sync_with_stdio(0);
    cin.tie(0);
    cin >> n;
    i=0;
    while (i<n)
    {
        cin >> c;
        if (c=='C')
        {
            mas[i]=1;
        }
        i++;
    }
    cin >> m;
    i=0;
    while (i<m)
    {
        cin >> l >> r;
        l--;
        r--;
        j=l;
        a[0]=0;
        a[1]=0;
        k.clear();
        rez=0;
        while (j<=r)
        {
            a[mas[j]]++;
            if (a[1]<a[0])
            {
                a[mas[j]]--;
                k.push_back(j);
                rez++;
            }
            j++;
        }
        a[0]=0;
        a[1]=0;
        j=r;
        it=k.end();
        it--;
        while (j>=l)
        {
            if (k.empty()||j!=*it)
            {
                a[mas[j]]++;
                if (a[1]<a[0])
                {
                    a[mas[j]]--;
                    rez++;
                    //cout << j << "\n";
                }
            }
            else
            {
                k.pop_back();
                it=k.end();
                it--;
            }
            j--;
        }
        cout << rez << "\n";
        i++;
    }
    return 0;
}

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