Submission #1022625

#	Time	Username	Problem	Language	Result	Execution time	Memory
1022625		dpsaveslives	Sirni (COCI17_sirni)	C++17	28 / 140	3732 ms	786432 KiB

sirni

#include <bits/stdc++.h>
using namespace std;
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;
struct edge{
    int u,v,w;
    bool operator<(const edge &b){
        return w < b.w;
    }
};
int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int N; cin >> N;
    vector<int> P(N);
    int maxx = 0;
    for(int i = 0;i<N;++i){
        cin >> P[i];
        maxx = max(maxx,P[i]);
    }
    D.init(N);
    P.resize(unique(P.begin(),P.end())-P.begin());
    sort(P.begin(),P.end());
    vector<edge> edges;
    for(int i = 0;i<N;++i){
        for(int j = P[i];j <= maxx; 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;
            }
            edge e; e.u = i; e.v = it2; e.w = P[it2]-j;
            edges.push_back(e);
        }
    }
    sort(edges.begin(),edges.end());
    int ans = 0, cnt = N-1;
    for(int i = 0;i<edges.size();++i){
        if(D.unite(edges[i].u,edges[i].v)){
            ans += edges[i].w;
            --cnt;
        }
        if(cnt == 0) break;
    }
    cout << ans << "\n";
    return 0;
}

Compilation message (stderr)

sirni.cpp: In function 'int main()':
sirni.cpp:58:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |     for(int i = 0;i<edges.size();++i){
      |                   ~^~~~~~~~~~~~~

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