Submission #80108

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
80108	2018-10-19 03:12:06	AngelKnows	Cave (IOI13_cave)	C++14	100 / 100	421 ms	520 KiB

cave

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#include "cave.h"
bool keep[5005];
int s[5005],d[5005]; 
void flip(int l,int r) {
  for (int j=l;j<=r;j++) {
    if (!keep[j]) s[j]=1-s[j];
  }
}
void exploreCave(int N) {
  for (int i=0;i<N;i++) s[i]=0;
  int x;
  int l,r,mid;
  for (int i=0;i<N;i++) {
    x=tryCombination(s);
    if (x!=i) flip(0,N-1);
    l=0,r=N-1;
    while (l<=r) {
      mid=(l+r)>>1;
      flip(l,mid);
      x=tryCombination(s);
      if (l==r) {
        if (x==i) s[l]=1-s[l],keep[l]=1;
        else keep[l]=1;
        d[l]=i;
        break;
      }
      if (x!=i) {
        flip(l,mid);
        r=mid;
 
 
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• Subtask 1: 12 / 12
• Subtask 2: 13 / 13
• Subtask 3: 21 / 21
• Subtask 4: 30 / 30
• Subtask 5: 24 / 24