40 lines
822 B
C++
40 lines
822 B
C++
#include "../../include/aoc.hpp"
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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ios::sync_with_stdio(0);
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cin.tie(0);
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unordered_set<string> all;
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unordered_map<string, unordered_set<string>> m;
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string line;
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while (getline(cin, line)) {
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string a = line.substr(0, 2);
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string b = line.substr(3, 5);
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all.insert(a);
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all.insert(b);
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m[a].insert(b);
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m[b].insert(a);
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}
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int count = 0;
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vector<string> vm;
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vm.assign(all.begin(), all.end());
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for (int i = 2; i < vm.size(); i++) {
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for (int j = 1; j < i; j++) {
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for (int k = 0; k < j; k++) {
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const string &a = vm[i], &b = vm[j], &c = vm[k];
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if (a[0] != 't' && b[0] != 't' && c[0] != 't') {
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continue;
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}
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if (m[a].contains(b) && m[b].contains(c) && m[c].contains(a)) {
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count++;
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}
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}
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}
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}
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cout << count << '\n';
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}
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