Submission #672501

#	Time	Username	Problem	Language	Result	Execution time	Memory
672501		tamthegod	Poklon (COCI17_poklon)	C++14	140 / 140	1000 ms	62668 KiB

poklon

// Make the best become better
// No room for laziness
#include<bits/stdc++.h>
 
#define int long long
#define pb push_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e6 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e18;
int n, q;
int a[maxN];
int st[4 * maxN];
vector<pair<int, int>> qu[maxN];
int res[maxN];
void update(int id, int l, int r, int pos, int val)
{
    if(l > pos || r < pos) return;
    if(l == r && l == pos)
    {
        st[id] = val;
        return;
    }
    int mid = (l + r) / 2;
    update(id * 2, l, mid, pos, val);
    update(id * 2 + 1, mid + 1, r, pos, val);
    st[id] = st[id * 2] + st[id * 2 + 1];
}
int get(int id, int l, int r, int u, int v)
{
    if(l > v || r < u) return 0;
    if(l >= u && r <= v) return st[id];
    int mid = (l + r) / 2;
    return get(id * 2, l, mid, u, v) + get(id * 2 + 1, mid + 1, r, u, v);
}
void ReadInput()
{
    cin >> n >> q;
    for(int i=1; i<=n; i++) cin >> a[i];
    for(int i=1; i<=q; i++)
    {
        int l, r;
        cin >> l >> r;
        qu[r].pb({l, i});
    }
}
void Solve()
{
    map<int, int> last[3];
    for(int i=1; i<=n; i++)
    {
        if(last[0][a[i]]) update(1, 1, n, last[0][a[i]], 1);
        if(last[1][a[i]]) update(1, 1, n, last[1][a[i]], -1);
        if(last[2][a[i]]) update(1, 1, n, last[2][a[i]], 0);
        last[2][a[i]] = last[1][a[i]];
        last[1][a[i]] = last[0][a[i]];
        last[0][a[i]] = i;
        for(auto v : qu[i])
            res[v.se] = get(1, 1, n, v.fi, i);
    }
    for(int i=1; i<=q; i++) cout << res[i] << '\n';
}
int32_t main()
{
    //freopen("x.inp", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ReadInput();
    Solve();
}

• Subtask 1: 140 / 140