Submission #61811

#	Time	Username	Problem	Language	Result	Execution time	Memory
61811		Benq	popa (BOI18_popa)	C++11	100 / 100	117 ms	824 KiB

popa

#include "popa.h"

#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 = 100001;

/*vi seq =  {12, 4, 16, 2, 2, 20};

int g(int l, int r) {
    int ret = 0;
    FOR(i,l,r+1) ret = __gcd(ret,seq[i]);
    return ret;
}

int query(int a, int b, int c, int d) {
    return g(a,b) == g(c,d);    
}*/

bool divi(int a, int b) {
    return query(b,a,a,a);
}

int join(int a, int b, int* R) { // a is higher
    R[a] = b;
    return a;
}

int solve(int N, int* Left, int* Right) {
    vi st;
    F0R(i,N) {
        int cur = -1;
        while (sz(st) && divi(i,st.back())) {
            cur = join(st.back(),cur,Right);
            st.pop_back();
        }
        // if (sz(st)) cout << "OOPS " << i << " " << st.back() << " " << divi(i,st.back()) << "\n";
        st.pb(i);
        Left[i] = cur, Right[i] = -1;
        /*for (int i: st) cout << i << " ";
        cout << "\n";*/
    }
    int cur = -1;
    while (sz(st)) {
        cur = join(st.back(),cur,Right);
        st.pop_back();
    }
    return cur;
}

/*int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    int* Left = new int[6];
    int* Right = new int[6];
    cout << solve(6,Left,Right) << "\n";
    F0R(i,6) cout << Left[i] << " ";
    cout << "\n";
    F0R(i,6) cout << Right[i] << " ";
    cout << "\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: 37 / 37
• Subtask 2: 24 / 24
• Subtask 3: 39 / 39