Submission #1022637

#	Time	Username	Problem	Language	Result	Execution time	Memory
1022637		dpsaveslives	Sirni (COCI17_sirni)	C++17	140 / 140	3167 ms	681768 KiB

sirni

#include <bits/stdc++.h>
#define f first
#define s second
using namespace std;
const int MAXN = 1e7+10;
vector<pair<int,int>> edges[MAXN];
struct DSU{
    int N;
    vector<int> d;
    void init(int n){
        N = n;
        d = vector<int>(N,-1);
    }
    int finden(int x){
        if(d[x] < 0) return x;
        return finden(d[x]);
    }
    bool unite(int a, int b){
        a = finden(a), b = finden(b);
        if(a == b) return false;
        if(d[a] > d[b]){
            swap(a,b);
        } //absolute of d[a] is smaller than absolute of d[b], so there are less in a than in b, although we want to add b to a
        d[a] += d[b]; d[b] = a;
        return true;
    }
}D;

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int N; cin >> N;
    vector<int> P(N);
    for(int i = 0;i<N;++i){
        cin >> P[i];
    }
    P.resize(unique(P.begin(),P.end())-P.begin());
    N = P.size();
    D.init(N);
    sort(P.begin(),P.end());
    for(int i = 0;i<N;++i){
        for(int j = P[i];j <= P.back(); j += P[i]){
            auto it = lower_bound(P.begin()+i+1,P.end(),j);
            if(it == P.end()) continue;
            int it2 = it-P.begin();
            if(P[it2]-j >= P[i]){
                continue;
            }
            edges[P[it2]-j].push_back({it2,i});
        }
    }
    long long ans = 0, cnt = N-1;
    for(int i = 0;i<MAXN;++i){
        for(auto p : edges[i]){
            if(D.unite(p.f,p.s)){
                ans += i;
            }
        }
    }
    cout << ans << "\n";
    return 0;
}

Compilation message (stderr)

sirni.cpp: In function 'int main()':
sirni.cpp:52:24: warning: unused variable 'cnt' [-Wunused-variable]
   52 |     long long ans = 0, cnt = N-1;
      |                        ^~~

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