Submission #202224

#	Time	Username	Problem	Language	Result	Execution time	Memory
202224		stefdasca	Election (BOI18_election)	C++14	0 / 100	14 ms	12152 KiB

election

#include<bits/stdc++.h>
#define god dimasi5eks
#pragma GCC optimize("O3")
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define mod 1000000007
#define dancila 3.14159265359
#define eps 1e-9

using namespace std;

typedef long long ll;

int n, q;

string s;

int aint[2000002], lazy[2000002], ans[500002];

vector<pair<int, int> >qu[500002];
void lz(int nod, int st, int dr)
{
    aint[nod] += lazy[nod];
    if(st != dr)
    {
        lazy[nod << 1] += lazy[nod];
        lazy[nod << 1|1] += lazy[nod];
    }
    lazy[nod] = 0;
}
void upd(int nod, int st, int dr, int L, int R, int val)
{
    lz(nod, st, dr);
    if(dr < L || st > R)
        return;
    if(L <= st && dr <= R)
    {
        lazy[nod] += val;
        lz(nod, st, dr);
        return;
    }
    int mid = (st + dr) / 2;
    upd(nod << 1, st, mid, L, R, val);
    upd(nod << 1|1, mid+1, dr, L, R, val);
    aint[nod] = min(aint[nod << 1], aint[nod << 1|1]);
}

int query(int nod, int st, int dr, int L, int R)
{
    lz(nod, st, dr);
    if(dr < L || st > R)
        return 100000001;
    if(L <= st && dr <= R)
        return aint[nod];
    int mid = (st + dr) / 2;
    return min(query(nod << 1, st, mid, L, R), query(nod << 1|1, mid+1, dr, L, R));
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n;
    cin >> s;
    s = ' ' + s;
    cin >> q;
    for(int i = 1; i <= q; ++i)
    {
        int a, b;
        cin >> a >> b;
        qu[b].pb({a, i});
    }
    vector<int> d;
    for(int i = 1; i <= n; ++i)
    {
        if(s[i] == 'T')
            d.pb(i);
        else
        {
            if(!d.empty())
            {
                upd(1, 1, n, (int) d.back(), n, -1);
                d.pop_back();
            }
            upd(1, 1, n, i, n, 1);
        }
        for(int j = 0; j < qu[i].size(); ++j)
        {
            int cs = qu[i][j].fi;
            int pz = qu[i][j].se;
            int sol = query(1, 1, n, cs, i);
            if(j > 0)
                sol -= query(1, 1, n, j-1, j-1);
            auto it = lower_bound(d.begin(), d.end(), cs);
            int cnt = (int) d.size() - (it - d.begin());
            ans[pz] = cnt - min(0, sol);
        }
    }
    for(int i = 1; i <= q; ++i)
        cout << ans[i] << '\n';
    return 0;
}

Compilation message (stderr)

election.cpp: In function 'int main()':
election.cpp:88:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j = 0; j < qu[i].size(); ++j)
                        ~~^~~~~~~~~~~~~~

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