Submission #311788

#	Time	Username	Problem	Language	Result	Execution time	Memory
311788		saarang123	Cave (IOI13_cave)	C++14	13 / 100	36 ms	512 KiB

cave

#include "cave.h"

void exploreCave(int n) {
    int a[n], s[n], d[n];
    for(int i = 0; i < n; i++)
        a[i] = 0, s[i] = 0, d[i] = -1;
    int x = tryCombination(a);
    while(x != -1) {
        int id, k;
        int mn = 0, mx = n - 1;
        while(mn < mx) {
            int mid = (mn + mx) >> 1;
            //cout << "Binsearch: " << mn << " " << mid << " " << mx << endl;
            for(int i = mn; i <= mid; i++)
                if(d[i] == -1) a[i] ^= 1;
            k = tryCombination(a);
            for(int i = mn; i <= mid; i++)
                if(d[i] == -1) a[i] ^= 1;
            if(k != x)
                mx = mid;
            else
                mn = mid + 1;
        }
        id = mn;
        //cout << "Binsearch end: " << id << " k: " << k << endl; cout << endl;
        if(k < x && k > -1) d[id] = k;
        else d[id] = x, a[id] ^= 1;
        x = tryCombination(a);
    }

    for(int i = 0; i < n; i++) s[i] = a[i];
    //answer(s, d);
    for(int i = 0; i < n; i++) {
        if(d[i] != -1) continue;
        s[i] ^= 1;
        d[i] = tryCombination(s);
        s[i] ^= 1;
    }
    answer(s, d);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:26:35: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   26 |         if(k < x && k > -1) d[id] = k;
      |                             ~~~~~~^~~

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