제출 #366589

#제출 시각아이디문제언어결과실행 시간메모리
366589PurpleCrayonHandcrafted Gift (IOI20_gift)C++17
100 / 100
611 ms50004 KiB
#include "gift.h" #include <bits/stdc++.h> using namespace std; #define ar array #define sz(v) int(v.size()) int construct(int n, int r, vector<int> a, vector<int> b, vector<int> x) { string ans(n, '?'); vector<vector<ar<int, 2>>> ev(n); vector<bool> bad(r, 1); for (int i = 0; i < r; i++){ if (a[i] == b[i]){ if (x[i] == 2) return 0; bad[i] = 0; continue; } ev[a[i]].push_back({0, i}); ev[b[i]].push_back({1, i}); } for (auto& v : ev) sort(v.begin(), v.end()); set<int> c[2]; int cnt[2]={}; for (int i = 0; i < n; i++){ if (cnt[0]){ ans[i] = i?ans[i-1]:'R'; for (auto v : c[0]) bad[v]=0; c[0].clear(); } else { ans[i] = i?ans[i-1]^'R'^'B':'R'; for (auto v : c[1]) bad[v]=0; c[1].clear(); } for (auto e : ev[i]){ if (e[0] == 0){ c[x[e[1]]-1].insert(e[1]); cnt[x[e[1]]-1]++; } else { c[x[e[1]]-1].erase(e[1]); cnt[x[e[1]]-1]--; } } } for (auto v : bad) if (v) return 0; craft(ans); return 1; }
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