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2023 day 4: remove goto and replace vector with set

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Due to popular demand
This commit is contained in:
eriedaberrie 2023-12-04 11:46:32 -08:00
parent 40024cef5b
commit 9057173ca5
2 changed files with 26 additions and 32 deletions
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15
2023/4/main-1.cpp
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@ -15,17 +15,16 @@ int main() {
string left = line.substr(start + 2, bar - start - 3);
string right = line.substr(bar + 2);
istringstream lss(left), rss(right);
vector<int> rv;
while (!rss.eof()) {
int n;
rss >> n;
rv.push_back(n);
}
set<int> ls;
while (!lss.eof()) {
int n;
lss >> n;
for (auto no : rv) {
if (no == n)
ls.insert(n);
}
while (!rss.eof()) {
int n;
rss >> n;
if (ls.find(n) != ls.end()) {
count <<= 1;
}
}

37
2023/4/main-2.cpp
View file

@ -5,45 +5,40 @@ int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int ret = 0;
vector<vector<int>> lefts, rights;
vector<int> copies;
vector<int> counts, copies;
string line;
while (getline(cin, line) && !line.empty()) {
copies.push_back(1);
int start = line.find(':');
int bar = line.find('|');
string left = line.substr(start + 2, bar - start - 3);
string right = line.substr(bar + 2);
istringstream lss(left), rss(right);
vector<int> rv, lv;
while (!rss.eof()) {
int n;
rss >> n;
rv.push_back(n);
}
rights.push_back(rv);
set<int> ls;
int count = 0;
while (!lss.eof()) {
int n;
lss >> n;
lv.push_back(n);
ls.insert(n);
}
lefts.push_back(lv);
while (!rss.eof()) {
int n;
rss >> n;
if (ls.find(n) != ls.end())
count++;
}
for (int cn = 0; cn < copies.size(); cn++) {
counts.push_back(count);
copies.push_back(1);
}
int ret = 0;
for (int cn = 0; cn < counts.size(); cn++) {
ret += copies[cn];
int n = cn;
for (int ln : lefts[cn]) {
for (int rn : rights[cn]) {
if (ln == rn) {
for (int i = 0; i < counts[cn]; i++) {
if (++n == copies.size())
goto end;
break;
copies[n] += copies[cn];
}
}
}
end:;
}
cout << ret << '\n';
}