I would like to ask for some help for the recent Code Jam problem Parenting
Partnering Returns. I wrote my solution in C++11.
My solution returns Sample Failed: WA - though I cannot figure out an
example test case that makes my code fail.
My solution is close to what was described in the analysis for Test Set 2 I
believe.
I use a priority queue to have the earliest start time (in case of equality
the earlier end time).
I keep a list of scheduled activities; those should never exceed 2 (or
equivalently one parent must be available) when scheduling a new activity,
otherwise it is impossible.
I am thinking of edge cases, but cannot figure out in which case this
fails. I would appreciate if someone could review my code and share any
feedback. Thank you in advance.
Below my code formatted using clang-format. I hope it is ok so.
#include <iostream>
#include <list>
#include <queue>
#include <set>
#include <string>
#include <utility>
int main() {
int T;
std::cin >> T;
for (size_t t = 1; t <= T; t++) {
int N;
std::cin >> N;
std::priority_queue<std::pair<int, int>, std::vector<std::pair<int,
int>>,
std::greater<std::pair<int, int>>>
q;
for (size_t n = 0; n < N; n++) {
std::pair<int, int> activity;
std::cin >> activity.first >> activity.second;
q.push(activity);
}
std::set<char> parents;
parents.insert('C');
parents.insert('J');
std::string output;
std::list<std::pair<std::pair<int, int>, char>> schedule;
bool impossible = false;
while (!q.empty()) {
std::pair<int, int> activity = q.top();
schedule.remove_if(
[&activity, &parents](const std::pair<std::pair<int, int>, char>
&scheduled_activity) mutable {
if (scheduled_activity.first.second <= activity.first) {
parents.insert(scheduled_activity.second);
return true;
}
return false;
});
if (parents.empty()) {
impossible = true;
break;
} else {
auto parent = parents.begin();
output.append(1, *parent);
schedule.push_back(std::make_pair(activity, *parent));
parents.erase(*parent);
}
q.pop();
}
if (impossible) {
std::cout << "Case #" << t << ": IMPOSSIBLE" << std::endl;
} else {
std::cout << "Case #" << t << ": " << output << std::endl;
}
}
return 0;
}
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