#include <vector>
using namespace std;
int tryCombination(vector<int> S) {
// This function will be provided by the grader
// It allows us to try a combination of switches and returns the first closed door
// If all doors are open, it returns -1
// The grader will ensure this function runs in O(N) time
// It may be called at most 70,000 times
}
void answer(vector<int> S, vector<int> D) {
// This procedure should be called when we have identified the correct positions of switches
// and the doors each switch is connected to
// It will cause the program to exit
// The format of parameters matches that of the tryCombination function
}
void exploreCave(int N) {
vector<int> switches(N, 0); // Initialize all switches to up position initially
// Try different combinations of switches to determine the correct position for each switch
// Use binary search strategy
int left = 0, right = N;
while (left < right) {
int mid = (left + right) / 2;
switches[mid] = 1; // Set the switch at mid position to down
int first_closed_door = tryCombination(switches);
if (first_closed_door == -1) {
// All doors are open, adjust the search range
right = mid;
} else {
// Adjust the search range based on the position of the first closed door
left = first_closed_door;
}
switches[mid] = 0; // Reset the switch position for next iteration
}
// Once we have determined the correct positions of switches, assign the doors each switch is connected to
vector<int> doors(N);
for (int i = 0; i < N; ++i) {
doors[i] = left + i;
}
// Provide the solution to the grader
answer(switches, doors);
}
// Example usage
int main() {
int N = 4; // Number of switches and doors
exploreCave(N);
return 0;
}
Compilation message
cave.cpp: In function 'int tryCombination(std::vector<int>)':
cave.cpp:11:1: warning: no return statement in function returning non-void [-Wreturn-type]
11 | }
| ^
/usr/bin/ld: /tmp/cclOQHOJ.o: in function `main':
cave.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccPLucfL.o:grader.c:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccPLucfL.o: in function `main':
grader.c:(.text.startup+0x10): undefined reference to `exploreCave'
collect2: error: ld returned 1 exit status
