Submission #107554

#	Time	Username	Problem	Language	Result	Execution time	Memory
107554		shoemakerjo	Cave (IOI13_cave)	C++14	100 / 100	379 ms	640 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>

using namespace std;
int *s, *d;

void exploreCave(int N) {
    /* ... */
    s = new int[N];
    d = new int[N];

    vector<int> curin;
    for (int i = 0; i < N; i++) {
      curin.push_back(i);
    }

    for (int i = 0; i < N; i++) {
      //set all to 0
      int cv = 0;
      for (int v : curin) {
        s[v] = 0;
      }
      int val = tryCombination(s);
      if (val == i) {
        cv = 1;
      }

      // cout << i << " --- " << cv << "   " << val << endl;
      // cout << "    ";
      // for (int v : curin) cout << v << " ";
      // cout << endl;

      int l = 0, r = curin.size()-1;
      for (int v : curin) s[v] = cv;

      while (l != r) {
        int mid = (l + r)/2;

        //try doing all from l to r
        for (int j = mid+1; j <= r; j++) {
          s[curin[j]] = 1-cv;
        }
        if (tryCombination(s) == i) {
          //this means that the righ has the ans
          for (int j = mid+1; j <= r; j++) {
            s[curin[j]] = cv;
            l = mid+1;
          }

        }
        else {
          r = mid;
        }
      }
      s[curin[l]] = cv;
      d[curin[l]] = i;
      curin.erase(curin.begin() + l);
    }

    answer(s, d);
}

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