Submission #1253890

#	Time	Username	Problem	Language	Result	Execution time	Memory
1253890		armashka	Election (BOI18_election)	C++20	28 / 100	3093 ms	980 KiB

election

#include <bits/stdc++.h>
#define pb push_back
#define all(v) v.begin(), v.end()
#define sz(x) (int)(x).size()

using namespace std;
using ll = long long;
using ld = long double;

const int N = 1e6 + 5;
const ll mod = 1e9 + 7;
const ld eps = 1e-6;
const ld Pi = acos(-1.0);

int n, q;
string s;
int used[N], timer;

void solve()
{
    cin >> n >> s;
    s = " " + s;
    // for (int i = 1; i <= n; ++i)
    // {
    //     pref[i] = pref[i - 1] + (s[i] == 'T');
    // }
    // for (int i = n + 1; i >= 1; --i)
    // {
    //     suf[i] = suf[i + 1] + (s[i] == 'T');
    // }

    cin >> q;
    for (int j = 1; j <= q; ++j)
    {
        int l, r;
        cin >> l >> r;

        int ans = 0, bal = 0;
        ++timer;
        for (int i = l; i <= r; ++i)
        {
            if (s[i] == 'C')
                ++bal;
            else
                --bal;

            if (bal < 0)
            {
                ++ans;
                ++bal;

                used[i] = timer;
            }
        }

        bal = 0;
        for (int i = r; i >= l; --i)
        {
            if (used[i] == timer)
                continue;
            if (s[i] == 'C')
                ++bal;
            else
                --bal;

            if (bal < 0)
            {
                ++ans;
                ++bal;

                used[i] = timer;
            }
        }

        cout << ans << "\n";
    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int tt = 1;

    // cin >> tt;
    for (int i = 1; i <= tt; ++i)
    {
        solve();
    }

    return 0;
}

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