Submission #649692

#	Time	Username	Problem	Language	Result	Execution time	Memory
649692		mychecksedad	Sirni (COCI17_sirni)	C++17	42 / 140	90 ms	48824 KiB

sirni

/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;

struct Dsu {
    vector<int> s, p;
    Dsu(int n){
        s.resize(n+1, 1);
        p.resize(n+1);
        for(int i = 0; i <= n; ++i) p[i] = i;
    }
    int find(int v){
        if(p[v] == v) return v;
        return (p[v] = find(p[v]));
    }
    void merge(int a, int b){
        a = find(a);
        b = find(b);
        if(a != b){
            if(s[a] > s[b]){
                swap(a, b);
            }
            s[b] += s[a];
            p[a] = b;
        }
    }
};

int n, a[N];
vector<int> v(2*N), is(2*N);
void solve(){
    cin >> n;
    for(int i = 0; i < n; ++i) cin >> a[i + 1];
    if(n <= 1000){
        Dsu d(n);
        vector<array<int, 3>> edges;
        for(int i = 1; i <= n; ++i) for(int j = i + 1; j <= n; ++j) edges.pb({min(a[i]%a[j], a[j]%a[i]), i, j});
        sort(all(edges));
        int ans = 0;
        for(auto v: edges){
            if(d.find(v[1]) != d.find(v[2])){
                d.merge(v[1], v[2]);
                ans += v[0];
            }
        }
        cout << ans;
    }else{
        Dsu d(N);
        for(int i = 1; i <= n; ++i) v[a[i]] = 1;
        for(int i = 1; i < N; ++i){
            if(v[i]){
                for(int j = i * 2; j < N; j += i){
                    is[j] = i;
                    if(v[j]) d.merge(i, j);
                }
            }
        }

        int last = 0;
        vector<array<ll, 3>> edges;

        for(int i = 1; i < N; ++i){
            // if(is[i]) last = i;
            // if(v[i]){
                // if(last>0) edges.pb({i - last, i, v[last] ? last : is[last]});
                // last = i;
            // }
        }

        sort(all(edges));
        ll ans = 0;
        for(auto v: edges){
            if(d.find(v[1]) != d.find(v[2])){
                d.merge(v[1], v[2]);
                ans += v[0];
            }
        }
        cout << ans;
    }
}





int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
        cout << '\n';
    }
    return 0;
 
}

Compilation message (stderr)

sirni.cpp: In function 'void solve()':
sirni.cpp:71:13: warning: unused variable 'last' [-Wunused-variable]
   71 |         int last = 0;
      |             ^~~~
sirni.cpp: In function 'int main()':
sirni.cpp:100:16: warning: unused variable 'aa' [-Wunused-variable]
  100 |     int T = 1, aa;
      |                ^~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 14
• Subtask 6: 0 / 14
• Subtask 7: 0 / 14
• Subtask 8: 0 / 14
• Subtask 9: 0 / 14
• Subtask 10: 0 / 14