AtCoder题解——Beginner Contest 170——A - Five Variables

题目相关

题目链接

AtCoder Beginner Contest 170 A题，https://atcoder.jp/contests/abc170/tasks/abc170_a。

真不好意思，水一题吧。大家原谅。

Problem Statement

We have five variables x1,x2,x3,x4, and x5.

The variable xi was initially assigned a value of i.

Snuke chose one of these variables and assigned it 0.

You are given the values of the five variables after this assignment.

Find out which variable Snuke assigned 0.

Input

Input is given from Standard Input in the following format:

x1 x2 x3 x4 x5

Output

If the variable Snuke assigned 0 was xi, print the integer i.

Samples1

Sample Input 1

0 2 3 4 5

Sample Output 1

1

Explaination

In this case, Snuke assigned 0 to x1, so we should print 1.

Samples2

Sample Input 2

1 2 0 4 5

Sample Output 2

3

Constraints

• The values of x1,x2,x3,x4, and x5 given as input are a possible outcome of the assignment by Snuke.

题解报告

题目翻译

就是给你 5 个数字，分别为 x1, x2, x3, x4 和 x5。请找出哪个位置的数字值为 0。

题目分析

学过循环就可以完成本题。当然没有学习过循环，只要学习了 if 语句，也可以完成。

非常简单的一个题目。我来凑数罢了。

AC 参考代码

使用 for

#include 
using namespace std;

int main() {
	int x;
	for (int i=1; i<6; i++) {
		cin>>x;
		if (0==x) {
			cout << i << endl;
			return 0;
		}
	}

	return 0;
}

仅使用 if

#include 
using namespace std;

int main() {
	int x1,x2,x3,x4,x5;
	cin>>x1>>x2>>x3>>x4>>x5;

	if (0==x1) {
		cout << "1" << endl;
	} else if (0==x2) {
		cout << "2" << endl;
	} else if (0==x3) {
		cout << "3" << endl;
	} else if (0==x4) {
		cout << "4" << endl;
	} else {
		cout << "5" << endl;
	}

	return 0;
}