Submission #57749

#	Time	Username	Problem	Language	Result	Execution time	Memory
57749		Benq	Poklon (COCI17_poklon)	C++14	56 / 140	5101 ms	37468 KiB

poklon

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;

template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define F0R(i, a) for (int i=0; i<(a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)

#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

const int MOD = 1000000007;
const ll INF = 1e18;
const int MX = 500001;

int N,Q, A[MX], ans[MX], oc[MX];
vector<array<int,3>> todo;
map<int,int> m;

bool cmp(array<int,3> a, array<int,3> b) {
    if (a[0]/sqrt(N) != b[0]/sqrt(N)) return a[0] < b[0];
    return a[1] < b[1];
}

int l = 0, r = -1, cans = 0;

void ad(int x, int y = 1) {
    x = A[x];
    if (oc[x] == 2) cans --;
    oc[x] += y;
    if (oc[x] == 2) cans ++;
}

int answer(int L, int R) {
    while (l > L) ad(--l);
    while (r < R) ad(++r);
    while (l < L) ad(l++,-1);
    while (r > R) ad(r--,-1);
    return cans;
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> N >> Q;
    int co = 0;
    F0R(i,N) {
        cin >> A[i];
        if (!m.count(A[i])) m[A[i]] = co++;
        A[i] = m[A[i]];
    }
    F0R(i,Q) {
        int a,b; cin >> a >> b;
        todo.pb({a-1,b-1,i});
    }
    sort(all(todo),cmp);
    for (auto a: todo) ans[a[2]] = answer(a[0],a[1]);
    F0R(i,Q) cout << ans[i] << "\n";
}

/* Look for:
* the exact constraints (multiple sets are too slow for n=10^6 :( ) 
* special cases (n=1?)
* overflow (ll vs int?)
* array bounds
*/

• Subtask 1: 56 / 140