제출 #604370

#제출 시각아이디문제언어결과실행 시간메모리
604370thezomb1e슈퍼트리 잇기 (IOI20_supertrees)C++17
11 / 100
218 ms22028 KiB
#include "supertrees.h" #include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> #define eb emplace_back #define pb push_back #define ft first #define sd second #define pi pair<int, int> #define all(x) (x).begin(), (x).end() #define rall(x) (x).rbegin(), (x).rend() #define dbg(...) dbg_out(__VA_ARGS__) using ll = long long; using ld = long double; using namespace std; using namespace __gnu_pbds; //Constants const ll INF = 5 * 1e18; const int IINF = 2 * 1e9; const ll MOD = 1e9 + 7; // const ll MOD = 998244353; const ll dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1}; const ld PI = 3.14159265359; //Templates template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) {return os << '(' << p.first << ", " << p.second << ')';} template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) {os << '['; string sep; for (const T &x : v) os << sep << x, sep = ", "; return os << ']';} void dbg_out() {cerr << endl;} template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cerr << H << ' '; dbg_out(T...); } template<typename T> void mins(T& x, T y) {x = min(x, y);} template<typename T> void maxs(T& x, T y) {x = max(x, y);} template<typename T> using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; template<typename T> using omset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>; //order_of_key(k): number of elements strictly less than k //find_by_order(k): k-th element in the set void setPrec() {cout << fixed << setprecision(15);} void unsyncIO() {cin.tie(0)->sync_with_stdio(0);} void setIn(string s) {freopen(s.c_str(), "r", stdin);} void setOut(string s) {freopen(s.c_str(), "w", stdout);} void setIO(string s = "") { unsyncIO(); setPrec(); if(s.size()) setIn(s + ".in"), setOut(s + ".out"); } int construct(vector<vector<int>> p) { int n = p.size(); for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) { if (p[i][j] == 3) return 0; } } // build cycles vector<vector<int>> ans(n, vector<int> (n, 0)); vector<int> comp(n, -1); int comp_num = 0; { vector<bool> vis(n, false); vector<int> path; function<void(int)> dfs = [&](int f) { vis[f] = true; path.pb(f); for (int to = 0; to < n; to++) { if (!vis[to] && p[f][to] == 2) { dfs(to); } } }; for (int i = 0; i < n; i++) { if (!vis[i]) { path.clear(); dfs(i); if ((int) path.size() == 2) { return 0; } if ((int) path.size() > 2) { int sz = path.size(); for (int j = 0; j < sz; j++) { comp[path[j]] = comp_num; ans[path[j]][path[(j + 1) % sz]] = ans[path[(j + 1) % sz]][path[j]] = 1; } comp_num++; } } } } // build bamboos { vector<bool> vis(n, false); vector<int> path; set<int> comps_vis; function<void(int)> dfs = [&](int f) { vis[f] = true; path.pb(f); for (int to = 0; to < n; to++) { if (!vis[to]) { if (p[f][to] == 1) dfs(to); else if (p[f][to] == 2) comps_vis.insert(comp[to]); } } }; for (int i = 0; i < n; i++) { if (!vis[i]) { comps_vis.clear(); path.clear(); dfs(i); if ((int) comps_vis.size() > 1) { return 0; } int sz = path.size(); for (int j = 0; j < sz; j++) { for (int z = j + 1; j < sz; j++) { if (p[path[j]][path[z]] != 1) { return 0; } } } for (int j = 0; j < sz - 1; j++) { ans[path[j]][path[j + 1]] = ans[path[j + 1]][path[j]] = 1; } } } } build(ans); return 1; }

컴파일 시 표준 에러 (stderr) 메시지

supertrees.cpp: In function 'void setIn(std::string)':
supertrees.cpp:43:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 | void setIn(string s) {freopen(s.c_str(), "r", stdin);}
      |                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
supertrees.cpp: In function 'void setOut(std::string)':
supertrees.cpp:44:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 | void setOut(string s) {freopen(s.c_str(), "w", stdout);}
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
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