Submission #1117286

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117286		hihihihaw	Sirni (COCI17_sirni)	C++17	140 / 140	4999 ms	517144 KiB

sirni

#pragma GCC optimize("O3,unroll-loops,fast-math")
#include <bits/stdc++.h>
using namespace std;

//#define int long long
#define pb push_back
#define pii pair<int, int>
#define sz(v) (int)v.size()
#define fi first
#define se second
#define INF 999999992000000023
#define MOD 1000000007
#define cint(x) int x;cin >> x;
#define cinarr(a, n)  int a[n]; for (int i = 0; i < n; i++) cin >> a[i];
#define coutarr(a) for (auto d : a){cout << d << " ";} cout << endl;
#define coutarrD(a) for (auto d : a) {cout << d.fi << "," << d.se << " "; }cout << endl;
#define BERKAY_TUP  ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define endl '\n'
#define ld long double
#define mid (start + end) / 2
#define vvi vector<vector<int>>

int t=1;
int interactive=0;
int usaco=0;
int testCase=0;
int a[10000023]={};
int pre[10000023];
int parent[10000023];
int find(int x){
    if (parent[x]==x) return x;
    return parent[x]=find(parent[x]);
}
void unionSet(int x,int y){
    x=find(x),y=find(y);
    if (x==y) return;
    parent[x]=y;
}
void solve(){
    int n;
    cin>>n;
    set<int> s;
    for (int i=0;i<n;i++){
        int x;
        cin>>x;
        s.insert(x);
    }
    for (auto d:s) a[d]=d;
    int x=0;
    for (int i=10000022;i>=0;i--){
        parent[i]=i;
        if (a[i]!=0) x=a[i];
        pre[i]=x;
    }
    vector<pair<int,pii>> v;
    for (int i=1;i<10000023;i++){
        if (a[i]==0) continue;
        for (int j=i;j<10000023;j+=i){
            
            int z;
            if (j==i) z=pre[j+1];
            else z=pre[j];
            //if (i==2 && j<20) cout<<z<<" "<<j<<endl;
            if (z/i==j/i && z!=0){
                v.pb({z%i,{i,z}});
            }
        }
    }
    sort(v.begin(),v.end());
    int ans=0;
    for (auto d:v){
        int x,y,c;
        x=d.se.fi,y=d.se.se,c=d.fi;
        if (find(x)!=find(y)){
            ans+=c;
            unionSet(x,y);
        }
    }
    cout<<ans<<endl;

    

}

int32_t main(){
    BERKAY_TUP;
    if (usaco)
    {
        freopen("help.in", "r", stdin);
        freopen("help.out", "w", stdout);
    }
    if (!interactive)
    {
#ifdef Local
        freopen("in.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
        // freopen("wormsort.out", "w", stdout);
#endif
    }
    if (t == 1)
        solve();
    else
    {
        cin >> t;
        while (t--)
        {
            testCase++;
            solve();
        }
    }

    return 0;
}

Compilation message (stderr)

sirni.cpp: In function 'int32_t main()':
sirni.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen("help.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
sirni.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         freopen("help.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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