Submission #101945

#	Time	Username	Problem	Language	Result	Execution time	Memory
101945		Plurm	Cave (IOI13_cave)	C++11	0 / 100	833 ms	492 KiB

cave

#include "cave.h"
#include <cstring>
void exploreCave(int N) {
	int arr[N];
	memset(arr,0,sizeof(arr));
	int forced[N];
	memset(forced,-1,sizeof(forced));
	int conn[N];
	int now[N];
	for(int i = 0; i < N; i++){
		if(tryCombination(arr) > i-1){
			int lo = 0;
			int hi = N-1;
			int mid;
			while(lo < hi){
				mid = (lo + hi)/2;
				for(int j = 0; j <= mid; j++){
					now[j] = !arr[j];
					if(forced[j] != -1) now[j] = forced[j];
				}
				for(int j = mid+1; j <= N; j++){
					now[j] = arr[j];
					if(forced[j] != -1) now[j] = forced[j];
				}
				if(tryCombination(arr) == i-1){
					hi = mid;
				}else{
					lo = mid+1;
				}
			}
			forced[lo] = 0;
			conn[lo] = i;
		}else{
			int lo = 0;
			int hi = N-1;
			int mid;
			while(lo < hi){
				mid = (lo + hi)/2;
				for(int j = 0; j <= mid; j++){
					now[j] = !arr[j];
					if(forced[j] != -1) now[j] = forced[j];
				}
				for(int j = mid+1; j <= N; j++){
					now[j] = arr[j];
					if(forced[j] != -1) now[j] = forced[j];
				}
				if(tryCombination(arr) > i-1){
					hi = mid;
				}else{
					lo = mid+1;
				}
			}
			forced[lo] = 1;
			conn[lo] = i;
		}
	}
	answer(forced, conn);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:9:6: warning: variable 'now' set but not used [-Wunused-but-set-variable]
  int now[N];
      ^~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24