제출 #540421

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
540421		levladiator	Sirni (COCI17_sirni)	C++14	0 / 140	710 ms	395936 KiB

sirni

#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define pf push_front
#define ll long long
#define ull unsigned long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define EPSILON 0.000001

using namespace std;

const ll NMAX = 1e7+5, INF = 1e18, MOD = 1e9+7, MMAX = 1e2 + 5, inf = INT_MAX;


ifstream fin("date.in");
ofstream fout("aleatoare.out");

int N,maxi;
int par[NMAX],siz[NMAX];
set<int> S;
vector<pair<int,int> > cnt[NMAX];
ll ans;

struct edge
{
    int a,b,cost;
};
vector<edge> edges,sorted;

int parent(int node)
{
    if(par[node]==node)return node;
    return(par[node]=parent(par[node]));
}

void dsu(int a,int b,int cost)
{
    a=parent(a);
    b=parent(b);
    if(a!=b)
    {
        if(siz[a]<siz[b])swap(a,b);
        siz[a]+=siz[b];
        par[b]=a;
        ans+=cost;
    }
}

bool cmp(edge a, edge b)
{
    return a.cost<b.cost;
}

void kruskal()
{
    int maxcost=0;
    for(auto x : edges)
    {
        cnt[x.cost].pb({x.a,x.b});
        maxcost=max(maxcost,x.cost);
    }
    for(int i=1;i<=maxcost;i++)
    {
        for(auto x : cnt[i])
        {
            sorted.pb({x.first,x.second,i});
        }
    }
    for(auto x : sorted)
    {
        int a=x.a;
        int b=x.b;
        int cost=x.cost;
        dsu(a,b,cost);
    }
}

int main()
{
    cin.tie ( 0 )->sync_with_stdio ( 0 );
    cin.tie ( NULL );
    cout.tie ( NULL );

    cin>>N;
    for(int i=1;i<=N;i++)
    {
        int x;
        cin>>x;
        S.insert(x);
        par[x]=x;
        siz[x]=1;
        maxi=max(maxi,x);
    }
    for(auto x : S)
    {
        if(x==maxi)
        {
            bool ok=1;
        }
        auto it=S.upper_bound(x);
        int a=x;
        if(it!=S.end())
        {
            int b=*it;
            int cost=*it-x;
            edges.pb({a,b,cost});
        }
        for(int j=2*x;j<=maxi;j+=x)
        {
            it=S.lower_bound(j);
            if(it!=S.end())
            {
                int b=*it;
                int cost=*it-j;
                edges.pb({a,b,cost});
            }
        }
    }
    kruskal();
    cout<<ans;

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

sirni.cpp: In function 'int main()':
sirni.cpp:99:18: warning: unused variable 'ok' [-Wunused-variable]
   99 |             bool ok=1;
      |                  ^~

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