Submission #992837

#	Time	Username	Problem	Language	Result	Execution time	Memory
992837		vjudge1	Cave (IOI13_cave)	C++17	Compilation error	0 ms	0 KiB

cave

#include "cave.h"
void exploreCave(int n) {
    int sure[n] = {}, correct[n] = {}, index[n] = {};
    for (int i = 0; i < n; i++) {
        int open = tryCombination(correct) == i;
        int l = 0, r = n-1;
        while (l < r) {
            const int mid = (l+r)/2;
            int cpy[n];
            memcpy(correct, cpy, sizeof cpy);
            if (!open)
                for (int i = mid+1; i < n; i++)
                    if (!sure[i])				
                        cpy[i] = 1;
            else
                for (int i = 0; i <= mid; i++)
                    if (!sure[i])
                        cpy[i] = 1;
            
            if (tryCombination(cpy) == i)
                l = mid+1;
            else
                r = mid;
        } 
        index[l] = i, correct[l] = open, sure[l] = 1;
    }
    answer(correct, index);
}

Compilation message (stderr)

cave.cpp: In function 'void exploreCave(int)':
cave.cpp:10:13: error: 'memcpy' was not declared in this scope
   10 |             memcpy(correct, cpy, sizeof cpy);
      |             ^~~~~~
cave.cpp:2:1: note: 'memcpy' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    1 | #include "cave.h"
  +++ |+#include <cstring>
    2 | void exploreCave(int n) {
cave.cpp:11:16: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   11 |             if (!open)
      |                ^