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Searched trought seats with iterator

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This commit is contained in:
Daniel Cortés
2020-12-05 07:25:51 -03:00
parent 01d1f9e7cd
commit 245e37d505
1 changed files with 5 additions and 8 deletions
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13
2020/day_5/binary_boarding.cc
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@@ -10,8 +10,7 @@ std::vector<std::string> read_input_file() {
std::vector<std::string> data;
std::string line;
while(std::getline(file, line))
data.push_back(line);
while(std::getline(file, line)) data.push_back(line);
return data;
}
@@ -28,10 +27,10 @@ int parse_id(std::string ticket) {
int solve_a(const std::set<int> &ids) { return *ids.rbegin(); }
int solve_b(const std::set<int> &ids) {
for(int id = 0; id < 1024; id++)
if(!ids.contains(id) && ids.contains(id+1) && ids.contains(id-1))
return id;
for(auto it = ++ids.begin(); it != ids.end(); it++){
auto prev = it; --prev;
if(*prev + 2 == *it) return *it - 1;
}
return 0;
}
@@ -39,6 +38,4 @@ int main() {
std::set<int> ids;
for(auto &ticket: read_input_file()) ids.insert(parse_id(ticket));
std::cout << solve_a(ids) << " " << solve_b(ids) << std::endl;
return 0;
}