제출 #1266937

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1266937		k12_khoi	Sirni (COCI17_sirni)	C++17	0 / 140	103 ms	235332 KiB

sirni

#include <bits/stdc++.h>
using namespace std;

#define ll long long

const int N=1e7+5;

struct edges
{
    int X,Y,Z;
} b[N];

bool cmp(edges x,edges y)
{
    return x.Z<y.Z;
}

int n,h,x,y,ma; ll res;
int nxt[N],par[N];
bool check[N];
vector <int> a,ve[N];

int acs(int u)
{
    if (par[u]<0) return u;
    return par[u]=acs(par[u]);
}

bool join(int u,int v)
{
    int x=acs(u);
    int y=acs(v);
    if (x!=y)
    {
        if (par[x]>par[y]) swap(x,y);
        par[x]+=par[y];
        par[y]=x;

        return true;
    }
    return false;
}

int main()
{
    freopen("SIRNI.INP","r",stdin);
    freopen("SIRNI.OUT","w",stdout);
    ios_base::sync_with_stdio(NULL);
    cin.tie(NULL); cout.tie(NULL);

    cin >> n;
    a.resize(n);
    for (int i=0;i<n;i++)
    cin >> a[i];

    sort(a.begin(),a.end());
    a.resize(unique(a.begin(),a.end())-a.begin());
    n=a.size();

    if (a[0]==1)
    {
        cout << 0;
        return 0;
    }


    for (int i=1;i<=n;i++)
    {
        nxt[a[i-1]]=i;
        par[i]=-1;
    }

    ma=a[n-1];
    for (int i=ma;i>=0;i--)
    if (nxt[i]==0) nxt[i]=nxt[i+1];

    for (int i=1;i<n;i++)
    {
        x=a[i-1];

        y=nxt[x+1];

        h++;
        b[h].X=i;
        b[h].Y=y;
        b[h].Z=a[y-1]-x;

        for (int j=2*x;j<=ma;j+=x)
        if (y!=nxt[j])
        {
            y=nxt[j];
            h++;
            b[h].X=i;
            b[h].Y=y;
            b[h].Z=a[y-1]-j;
        }
        else b[h].Z=a[y-1]-j;
    }

    sort(b+1,b+h+1,cmp);

    for (int i=1;i<=h;i++)
    if (join(b[i].X,b[i].Y)) res+=b[i].Z;

    cout << res;
}

컴파일 시 표준 에러 (stderr) 메시지

sirni.cpp: In function 'int main()':
sirni.cpp:46:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     freopen("SIRNI.INP","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
sirni.cpp:47:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |     freopen("SIRNI.OUT","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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