【題解】ZeroJudge b162: NOIP2007 1.统计数字

#include <iostream>
#include <map>
using namespace std;
map<int,int> mp;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, x;
    cin >> n;
    for (int i = 0; i < n; i++){
        cin >> x;
        mp[x]++;
    }
    for (auto i: mp){
        cout << i.first << " " << i.second << "\n";
    }
    return 0;
}

n = int(input())
dic = {}
for i in range(n):
    x = int(input())
    dic[x] = dic.get(x, 0) + 1
    
for k in sorted(dic.keys()):
    print(k, dic[k])