My solution to HackerRanks New Year Chaos problem
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#include <iostream> | |
#include <string> | |
int main() { | |
int T; // Number of test cases 1 <= T <= 10 | |
int N; // Number of people in line 1 <= N <= 10^5 | |
std::cin >> T; | |
for (int t = 0; t < T; t++) { // For each test case | |
std::cin >> N; // Get the number of people | |
int n; | |
/* | |
So we can have a 1-based array as opposed to 0-based, makes things easier | |
since n>=1 | |
*/ | |
int line[N + 1]; | |
bool is_chaotic = false; //To check for chaotic while reading in numbers | |
/* | |
Read in the numbers and store them in the line array. | |
This is also where we check for chaotic or not. If by the end of this | |
loop we haven't said its chaotic, we never will. | |
Note: n=1 Because we are working with 1-based array instead of 0 | |
*/ | |
for (n = 1; n <= N; n++) { | |
int x; | |
std::cin >> x; | |
/* | |
The reason for the flag instead of simply breaking here is because we | |
still need to read in all the inputs. | |
This condition is the ONLY way for the line to be chaotic. | |
If it is chaotic we don't need to waste the time to store the values | |
*/ | |
if (x > n + 2) is_chaotic = true; | |
else line[n] = x; | |
} | |
if (is_chaotic) { | |
/* | |
Now that we have read all the numbers in, we can call it quits now if | |
its chaotic | |
*/ | |
std::cout << "Too chaotic" << std::endl; | |
} else { | |
int count = 0; // AKA number of bribes | |
for (n = N; n > 0; n--) { | |
int x = line[n]; // Person A | |
if (x != n) { | |
count++; // They must have bribed at least once | |
int y = line[n - 1]; // Person B | |
line[n - 1] = x; | |
if (y != n) { | |
count++; | |
int z = line[n - 2]; // Person C | |
line[n] = z; | |
line[n - 2] = y; | |
} else { | |
line[n] = y; | |
} | |
} // else x == n in which case nothing needs to be done | |
} | |
std::cout << std::to_string(count) << std::endl; | |
} | |
} | |
return 0; | |
} |
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