Submission #732225

#	Time	Username	Problem	Language	Result	Execution time	Memory
732225		GrindMachine	Garaža (COCI17_garaza)	C++17	160 / 160	658 ms	33080 KiB

garaza

// Om Namah Shivaya

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

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
edi

*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

template<typename T>
struct segtree {
    // https://codeforces.com/blog/entry/18051

    /*=======================================================*/

    struct data {
        vector<pll> pref, suff;
        ll cnt;

        data() {
            cnt = 0;
        }
    };

    data neutral = data();

    data merge(data &left, data &right) {
        data curr;

        curr.pref = left.pref;

        for (auto [x, c] : right.pref) {
            if (curr.pref.empty()) {
                curr.pref.pb({x, c});
            }
            else {
                ll p = curr.pref.back().ff;
                ll g = gcd(x, p);
                if (g == p) {
                    curr.pref.back().ss += c;
                }
                else {
                    curr.pref.pb({g, c});
                }
            }
        }

        curr.suff = right.suff;

        for (auto [x, c] : left.suff) {
            if (curr.suff.empty()) {
                curr.suff.pb({x, c});
            }
            else {
                ll p = curr.suff.back().ff;
                ll g = gcd(x, p);
                if (g == p) {
                    curr.suff.back().ss += c;
                }
                else {
                    curr.suff.pb({g, c});
                }
            }
        }

        curr.cnt = left.cnt + right.cnt;

        ll ptr = sz(right.pref) - 1;
        ll guys = 0;
        for (auto [x, c] : right.pref) {
            guys += c;
        }

        for (auto [x, c] : left.suff) {
            while (ptr >= 0) {
                if (gcd(x, right.pref[ptr].ff) == 1) {
                    guys -= right.pref[ptr].ss;
                    ptr--;
                }
                else {
                    break;
                }
            }

            curr.cnt += guys * c;
        }

        return curr;
    }

    void create(int i, T v) {
        tr[i].pref = {{v, 1}};
        tr[i].suff = {{v, 1}};
        tr[i].cnt = (v > 1);
    }

    void modify(int i, T v) {
        tr[i].pref = {{v, 1}};
        tr[i].suff = {{v, 1}};
        tr[i].cnt = (v > 1);
    }

    /*=======================================================*/

    int n;
    vector<data> tr;

    segtree() {

    }

    segtree(int siz) {
        init(siz);
    }

    void init(int siz) {
        n = siz;
        tr.assign(2 * n, neutral);
    }

    void build(vector<T> &a, int siz) {
        rep(i, siz) create(i + n, a[i]);
        rev(i, n - 1, 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
    }

    void pupd(int i, T v) {
        modify(i + n, v);
        for (i = (i + n) >> 1; i; i >>= 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
    }

    data query(int l, int r) {
        data resl = neutral, resr = neutral;

        for (l += n, r += n; l <= r; l >>= 1, r >>= 1) {
            if (l & 1) resl = merge(resl, tr[l++]);
            if (!(r & 1)) resr = merge(tr[r--], resr);
        }

        return merge(resl, resr);
    }
};

void solve(int test_case)
{
    ll n, q; cin >> n >> q;
    vector<ll> a(n + 5);
    rep1(i, n) cin >> a[i];

    segtree<ll> st(n + 5);
    st.build(a, n + 1);

    while (q--) {
        ll t; cin >> t;
        if (t == 1) {
            ll i, v; cin >> i >> v;
            st.pupd(i, v);
        }
        else {
            ll l, r; cin >> l >> r;
            ll ans = st.query(l, r).cnt;
            cout << ans << endl;
        }
    }
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

• Subtask 1: 40 / 40
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40
• Subtask 4: 40 / 40