484 – The Department of Redundancy Department

Count and print. C++ code:

#include <cstdio>
#include <vector>
#include <map>
using namespace std;

typedef long long int64;

map<int64, int64> nInput;
vector<int64> input;
int64 n;

int main() {
	// input
	while (scanf("%lld", &n) == 1) {
		if (!nInput[n])
			input.push_back(n);
		nInput[n]++;
	}
	// output
	for (unsigned int i = 0; i < input.size(); ++i)
		printf("%lld %lld\n", input[i], nInput[input[i]]);
	return 0;
}