제출 #314870

#제출 시각아이디문제언어결과실행 시간메모리
314870shafinalam동굴 (IOI13_cave)C++14
100 / 100
380 ms632 KiB
#include "cave.h" void exploreCave(int N) { int S[N], D[N]; for(int i = 0; i < N; i++) { S[i] = 0; D[i] = -1; } for(int i = 0; i < N; i++) { int last = tryCombination(S); int st = 0; if(last==i) st = 1; int lo = 0, hi = N-1, pos = -1; while(lo<=hi) { int mid = (lo+hi)>>1; for(int j = lo; j <= mid; j++) if(D[j]==-1) S[j] = 1-S[j]; int p = tryCombination(S); for(int j = lo; j <= mid; j++) if(D[j]==-1) S[j] = 1-S[j]; if(st) { if(p>i || p==-1) { pos = mid; hi = mid-1; } else lo = mid+1; } else { if(p==i) { pos = mid; hi = mid-1; } else lo = mid+1; } } S[pos] = st; D[pos] = i; } answer(S, D); }
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