Submission #332601

#	Time	Username	Problem	Language	Result	Execution time	Memory
332601		souvenir_vayne	Sjekira (COCI20_sjekira)	C++14	110 / 110	56 ms	7148 KiB

sjekira

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <chrono>
#define pb push_back
#define INF 0x3f3f3f3f
//#define LINF 0x3f3f3f3f3f3f3f3f
//#define endl '\n'
#define ll long long
#define f first
#define int long long
#define fin cin
#define fout cout
#define s second
#define FAST cin.tie(0), cout.tie(0), ios::sync_with_stdio(0)
#define debug(x) cout << "DEBUG " << x << endl
#define debug2(x, y) cout << "DEBUG " << x << " " << y << endl
#define debug3(x, y, z) cout << "DEBUG " << x << " " << y << " " << z<< endl
#define debug4(x, y, z, o) cout << "DEBUG " << x << " " << y << " " << z<< " " << o << endl
#define all(x) x.begin(), x.end()
#define left vadia
#define lb lower_bound
#define right puta
using namespace std;
using namespace __gnu_pbds;
void setIO(string s) {
  ios_base::sync_with_stdio(0); cin.tie(0);
  freopen((s+".in").c_str(),"r",stdin);
  freopen((s+".out").c_str( ),"w",stdout);
}
typedef pair<ll, ll> pii;
typedef vector<vector<char>> mat;
typedef pair<int, string> pis;
const ll mod = 1e9+7;
typedef vector<int> vi;
typedef pair<int, pair<int, int>> piii;

const int MAXN = 1e5+5;
int p[MAXN], pai[MAXN];

bool cmp(pii a, pii b) {
    return max(p[a.f], p[a.s]) < max(p[b.f], p[b.s]);
}

int ans = 0;

int find(int x) {
    if(pai[x] == x)
        return x;
    else return pai[x] = find(pai[x]);
}

void query(int a, int b) {
    a = find(a), b = find(b);
    if(a != b) {
        if(p[a] < p[b])
            swap(a, b);
        ans += p[a] + p[b];
        pai[b] = a;
    }
}

int32_t main() {

    FAST;
    int n;
    cin >> n;

    for(int i = 1; i <= n; i++) {
        cin >> p[i];
        pai[i] = i;
    }

    vector<pii> e(n-1);
    for(pii &i : e)
        cin >> i.f >> i.s;
    sort(all(e), cmp);

    for(pii &i : e)
        query(i.f, i.s);

    cout << ans << endl;



}

Compilation message (stderr)

sjekira.cpp: In function 'void setIO(std::string)':
sjekira.cpp:27:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   27 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sjekira.cpp:28:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   28 |   freopen((s+".out").c_str( ),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 30 / 30
• Subtask 4: 60 / 60