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OI-codes/Luogu/P1097/P1097.cpp

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#include <bits/stdc++.h>
using namespace std;
int main() {
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set<int> s;
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map<int, int> m;
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int n, t;
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cin >> n;
while (n--) {
cin >> t;
s.insert(t);
m[t]++;
}
for (set<int>::iterator it = s.begin(); it != s.end(); it++) {
cout << *it << ' ' << m[*it] << endl;
}
return 0;
}