This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// Autor: Ante Derek
#include <iostream>
#include <string>
#include <map>
#include <set>
#include <vector>
#include <cassert>
#include <algorithm>
#define TRACE(x) cerr << #x << " = " << x << endl
#define _ << " _ " <<
using namespace std;
map<string, int> index;
vector<vector<int>> parents;
int process(const string &k, const vector<string> &p) {
int m = index.size();
if (index.count(k))
return 0;
vector<int> pp;
for (auto x : p) {
if (index.count(x) == 0)
return 0;
pp.push_back(index[x]);
}
sort(pp.begin(), pp.end());
vector<int> seen(m, 0);
for (int i=(int)pp.size()-1; i>=0; i--) {
int y = pp[i];
if (seen[y])
continue ;
for (auto z : parents[y]) {
if (seen[z])
return 0;
seen[z] = 1;
}
}
index[k] = m;
for (auto y : pp)
seen[y] = 1;
parents.push_back(vector<int>());
for (int i=0; i<m; i++)
if (seen[i])
parents[m].push_back(i);
return 1;
}
int main() {
int n;
cin >> n;
for (int i=0; i<n; i++) {
string k;
vector<string> p;
string temp;
cin >> k >> temp;
assert(temp == ":");
cin >> temp;
while (temp != ";") {
p.push_back(temp);
cin >> temp;
}
if (process(k, p))
cout << "ok" << endl;
else
cout << "greska" << endl;
}
return 0;
}
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