제출 #1074201

#제출 시각아이디문제언어결과실행 시간메모리
1074201c2zi6수천개의 섬 (IOI22_islands)C++17
24 / 100
27 ms6528 KiB
#define _USE_MATH_DEFINES #include <bits/stdc++.h> #define ff first #define ss second #define pb push_back #define all(a) (a).begin(), (a).end() #define replr(i, a, b) for (int i = int(a); i <= int(b); ++i) #define reprl(i, a, b) for (int i = int(a); i >= int(b); --i) #define rep(i, n) for (int i = 0; i < int(n); ++i) #define mkp(a, b) make_pair(a, b) using namespace std; typedef long long ll; typedef long double ld; typedef pair<int, int> PII; typedef vector<int> VI; typedef vector<PII> VPI; typedef vector<VI> VVI; typedef vector<VVI> VVVI; typedef vector<VPI> VVPI; typedef pair<ll, ll> PLL; typedef vector<ll> VL; typedef vector<PLL> VPL; typedef vector<VL> VVL; typedef vector<VVL> VVVL; typedef vector<VPL> VVPL; template<class T> T setmax(T& a, T b) {if (a < b) return a = b; return a;} template<class T> T setmin(T& a, T b) {if (a < b) return a; return a = b;} #include <ext/pb_ds/assoc_container.hpp> using namespace __gnu_pbds; template<class T> using indset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; #include "islands.h" int n, m; VVPI gp; stack<PII> st; VI onstack, vis; VI path, cycle; bool dfs(int u = 0, int pi = -1) { /*cout << "currently at " << u << endl;*/ vis[u] = true; onstack[u] = true; if (pi != -1) st.push({u, pi}); for (auto[v, i] : gp[u]) if (i != pi) { /*cout << "trying to move to " << v << " via edge " << i << endl;*/ if (onstack[v]) { /*cout << "CYCLE DETECTED" << endl;*/ cycle.pb(i); while (st.size()) { if (st.top().ff == v) break; cycle.pb(st.top().ss); st.pop(); } while (st.size()) { path.pb(st.top().ss); st.pop(); } reverse(all(path)); reverse(all(cycle)); /*for (int x : path) cout << x << " "; cout << "| ";*/ /*for (int x : cycle) cout << x << " "; cout << endl;*/ return true; } if (vis[v]) continue; /*cout << "moved successfully" << endl;*/ if (dfs(v, i)) return true; } onstack[u] = false; st.pop(); return false; } VI rev(VI a) { reverse(all(a)); return a; } int myus(int x) { int type = !(x%2); return x/2*2+type; } variant<bool, VI> find_journey(int N, int M, VI U, VI V) { n = N; m = M; gp = VVPI(n); rep(i, m) gp[U[i]].pb({V[i], i}), i++; onstack = vis = VI(n); if (dfs()); else return false; VI ans; for (int x : path) ans.pb(x); for (int x : cycle) ans.pb(x); for (int x : cycle) ans.pb(myus(x)); for (int x : rev(cycle)) ans.pb(x); for (int x : rev(cycle)) ans.pb(myus(x)); for (int x : rev(path)) ans.pb(x); return ans; }
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