洛谷 P1909 [NOIP2016 普及组] 买铅笔

题目描述： 

 

 

---

AC代码： 

#include
 
using namespace std;
 
int main()
{
	int n,res = 0;
	int min = 1e8 + 10;
	cin >> n;
	int num,price;
	for(int i=0;i<3;i++){
		cin >> num >> price;
		int temp = n % num;
		if(temp != 0){
			res = (n / num + 1) * price;
			if(min > res)
				min = res;
		}
		if(temp == 0){
			res = (n/num) * price;
			if(min > res)
				min = res;
		}
	}
	cout << min << endl;
	return 0;
}