제출 #648219

#제출 시각아이디문제언어결과실행 시간메모리
648219rafatoa커다란 상품 (IOI17_prize)C++17
0 / 100
95 ms296 KiB
#include <bits/stdc++.h> #include "prize.h" using namespace std; using Query = vector<int>; int find_best(int n) { auto valid = [&](Query x) { return x[0] + x[1] == 0; }; int ans = -1; function<void(int, int, Query, Query)> dfs = [&](int l, int r, Query L, Query R) { if (l + 1 >= r || ans != -1) { return; } int mid = (l + r) >> 1; Query M = ask(mid); if (valid(M)) { ans = mid; return; } // if (L[0] + L[1] == R[0] + R[1] && L[0] + L[1] > M[0] + M[1] && L[1] - R[1] == 1) { // return; // } dfs(l, mid, L, M), dfs(mid, r, M, R); }; Query L = ask(0); if (valid(L)) { return 0; } Query R = ask(n - 1); if (valid(R)) { return n - 1; } dfs(0, n - 1, L, R); return ans; }
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