Submission #104678

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
104678	2019-04-08 19:00:03	Erkhemkhuu	Cave (IOI13_cave)	C++17	100 / 100	534 ms	560 KiB

cave

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
#include <bits/stdc++.h>
#include "cave.h"
using namespace std;
#define n 5005
bool vis[n + 5];
int ind[n + 5], switches[n + 5];
void run(int l, int r, bool flag) {
  int i;
  for(i = l; i <= r; i++)
    if(!vis[i]) switches[i] = flag;
  return;
}
void exploreCave(int N) {
  memset(vis, false, sizeof(vis));
  memset(ind, 0, sizeof(ind));
  int i, l, r, mid;
  bool flag;
  for(i = 0; i < N; i++) {
    run(0, N - 1, false);
    flag = tryCombination(switches) == i;
    l = 0; r = N ;
    while(l != r) {
      int mid = (l + r) / 2;
      run(l, mid, flag);
      run(mid + 1, r, flag ^ 1);
      if(tryCombination(switches) == i) l = mid + 1;
      else r = mid;
    }
    vis[l] = true;
    switches[l] = flag;
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:16:15: warning: unused variable 'mid' [-Wunused-variable]
  int i, l, r, mid;
               ^~~

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