Submission #1174195

#	Time	Username	Problem	Language	Result	Execution time	Memory
1174195		InvMOD	Sirni (COCI17_sirni)	C++20	0 / 140	186 ms	5004 KiB

sirni

#include<bits/stdc++.h>

using namespace std;

#define sz(v) (int)(v).size()

#define all(v) (v).begin(), (v).end()
#define compact(v) (v).erase(unique(all(v)), (v).end())

using ll = long long;

struct DSU{
    vector<int> par;
    DSU(int n = 0): par(n + 1, -1) {}

    int asc(int x){
        return par[x] < 0 ? x : par[x] = asc(par[x]);
    }

    bool join(int u, int v){
        u = asc(u), v = asc(v);
        if(u == v) return false;

        if(par[u] > par[v]) swap(u, v);

        par[u] += par[v];
        par[v] = u;
        return true;
    }
};

struct Edge{
    int u,v,w;
    Edge(int u = 0, int v = 0, int w = 0): u(u), v(v), w(w) {}

    bool operator < (const Edge& q) const{
        return w < q.w;
    }
};

void solve()
{
    int n; cin >> n;

    vector<int> a(n);
    for(int i = 0; i < n; i++){
        cin >> a[i];
    }

    sort(all(a)), compact(a);

    vector<int> Mn(sz(a), 0), Mn2(sz(a), sz(a) - 1);
    for(int i = sz(a) - 1; i >= 0; i--){
        int nxt = a[i], p = lower_bound(1 + i + all(a), nxt) - a.begin();

        while(p < sz(a)){
            if(a[p] % a[i] < a[p] % a[Mn[p]]){
                Mn[p] = i;
            }

            if(a[p] % a[i] < a[Mn2[i]] % a[i]){
                Mn2[i] = p;
            }

            nxt += a[i];
            p = lower_bound(1 + i + all(a), nxt) - a.begin();
        }
    }

    vector<Edge> E;
    for(int i = 0; i < sz(a); i++){
        if(i > 0) E.push_back(Edge(i, Mn[i], a[i] % a[Mn[i]]));
        if(i < sz(a) - 1) E.push_back(Edge(i, Mn2[i], a[Mn2[i]] % a[i]));
    }
    sort(all(E));

    ll answer = 0; DSU dsu(sz(a));
    for(int i = 0; i < sz(E); i++){
        if(dsu.join(E[i].u, E[i].v)){
            answer += 1ll * E[i].w;
        }
    }

    cout << answer << "\n";
}

int32_t main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP", "r", stdin);
        freopen(name".OUT", "w", stdout);
    }

    solve();
    return 0;
}

Compilation message (stderr)

sirni.cpp: In function 'int32_t main()':
sirni.cpp:93:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |         freopen(name".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sirni.cpp:94:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |         freopen(name".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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