제출 #212778

#제출 시각아이디문제언어결과실행 시간메모리
212778BThero조이터에서 친구를 만드는건 재밌어 (JOI20_joitter2)C++17
0 / 100
5 ms384 KiB
#define DBG 1 // chrono::system_clock::now().time_since_epoch().count() #include<bits/stdc++.h> //#include<ext/pb_ds/tree_policy.hpp> //#include<ext/pb_ds/assoc_container.hpp> #define pb push_back #define eb emplace_back #define mp make_pair #define fi first #define se second #define all(x) (x).begin(), (x).end() #define debug(x) if (DBG) cerr << #x << " = " << x << endl; using namespace std; //using namespace __gnu_pbds; typedef long long ll; typedef pair<int, int> pii; //template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; const int MAXN = 55; int par[MAXN], sz[MAXN]; set<int> adj[MAXN]; set<pii> e; int n, m; int getPar(int x) { if (x == par[x]) { return x; } return par[x] = getPar(par[x]); } void uni(int a, int b) { a = getPar(a); b = getPar(b); if (a != b) { sz[a] += sz[b]; par[b] = a; } } void compress() { set<pii> e2; for (auto it : e) { int u = it.fi; int v = it.se; u = getPar(u); v = getPar(v); if (u != v) { e2.insert(mp(u, v)); } } e = e2; for (int i = 1; i <= n; ++i) { set<int> s; for (int x : adj[i]) { x = getPar(x); if (x != getPar(i)) { s.insert(x); } } adj[i] = s; } } void solve() { scanf("%d %d", &n, &m); for (int i = 1; i <= n; ++i) { par[i] = i; sz[i] = 1; } for (int i = 1; i <= m; ++i) { int u, v; scanf("%d %d", &u, &v); u = getPar(u); v = getPar(v); e.insert(mp(u, v)); adj[u].insert(v); if (e.find(mp(v, u)) != e.end()) { uni(u, v); } compress(); ll ans = 0; for (int j = 1; j <= n; ++j) { if (par[j] == j) { ans += sz[j] * (sz[j] - 1ll); } } for (int j = 1; j <= n; ++j) { for (int x : adj[j]) { ans += sz[x]; } } printf("%lld\n", ans); } } int main() { int tt = 1; while (tt--) { solve(); } return 0; }

컴파일 시 표준 에러 (stderr) 메시지

joitter2.cpp: In function 'void solve()':
joitter2.cpp:80:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
joitter2.cpp:89:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &u, &v);
         ~~~~~^~~~~~~~~~~~~~~~~
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