Submission #393056

#	Time	Username	Problem	Language	Result	Execution time	Memory
393056		abdzag	Connecting Supertrees (IOI20_supertrees)	C++17	Compilation error	0 ms	0 KiB

supertrees

#include<bits/stdc++.h>
#include<unordered_set>

#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define rep(i,a,b) for(int i = a; i<int(b);++i)
#define rrep(i,a,b) for(int i = a; i>int(b);--i)
#define all(v) v.begin(),v.end()
#define trav(a, x) for(auto& a : x)

typedef long long ll;


const long long inf = 1e15;

using namespace std;

void printint(vector < ll > vec)
{
    for (auto a : vec) {
        cout << a << " ";
    }
    cout << endl;
}


bool sortcol(const vector<int>& v1,
    const vector<int>& v2) {
    return v1[1] < v2[1];
}
void printsetint(set<ll> s) {
    for (auto it = s.begin(); it != s.end(); ++it) {
        cout << *it;
    }
}
void printsetpairint(set<pair<int, int>> s) {
    for (auto it = s.begin(); it != s.end(); ++it) {
        pair<int, int> cur = *it;
        cout << cur.first << " " << cur.second;
    }
    cout << endl;
}
void printsetstring(set<string> s) {
    for (auto it = s.begin(); it != s.end(); ++it) {
        cout << *it << endl;
    }
}
vector<ll> p(2001);
vector<ll> Urank(2001);
ll UfindSet(ll i) {
    if (p[i] == i)return i;
    return p[i] = UfindSet(p[i]);
}
void UjoinSet(ll i, ll j) {
    ll si = UfindSet(i);
    ll sj = UfindSet(j);
    if (sj == si) return;
    if (Urank[sj] > Urank[si]) swap(i, j);
    p[sj] = si;
    if (Urank[si] == Urank[sj])Urank[si]++;
    return;
}

ll construct(vector<vector<ll>> v) {
    rep(i, 0, p.size())p[i] = i;
    ll n = v.size();
    rep(i, 0, n) {
        rep(j, 0, n) {
            if (v[i][j]) {
                UjoinSet(i, j);
            }
        }
    }
    vector<vector<ll>> ans(n, vector<ll>(n));
    rep(i, 0, n) {
        if (p[i] != i) {
            ans[i][p[i]] = 1;
            ans[p[i]][i] = 1;
        }
    }
    build(ans);
    return 1;
}
int main()
{
    cin.sync_with_stdio(false);
    ll m;
    cin >> m;
    vector<vector<ll>> g(m, vector<ll>(m));
    rep(i, 0, m){
        rep(j, 0, m) {
            cin >> g[i][j];
        }
    }
    construct(g);
    return 0;
}

Compilation message (stderr)

supertrees.cpp: In function 'll construct(std::vector<std::vector<long long int> >)':
supertrees.cpp:80:5: error: 'build' was not declared in this scope
   80 |     build(ans);
      |     ^~~~~