[BOJ 11650] vector에서 pair를 대상으로 정렬

	#define _CRT_SECURE_NO_WARNINGS
	#include <cstdio>
	#include <algorithm>
	#include <vector>
	using namespace std;
	vector<pair<int, int>> vec;
	int main(void) {
	int n,x,y;
	scanf("%d", &n);
	for (int i = 0; i < n; i++) {
	scanf("%d%d", &x, &y);
	vec.push_back(make_pair(x, y));
	}
	sort(vec.begin(), vec.end());
	for (int i = 0; i < n; i++) {
	printf("%d %d\n", vec[i].first, vec[i].second);
	}
	}

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