TASK

Problem

#38

Given two non-zero integers `a` and `b`, print `YES` if they have the same sign, else `NO`.

EXAMPLE

Example

Input

-4 -9

Output

YES

LIMITS

Constraints

a ≠ 0; b ≠ 0

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LEARN Theory for this problem

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### Same Sign

`if / else if / else` chooses a branch from boolean conditions. Comparisons such as `<`, `>=`, `===` and logical operators `&&`, `||`, `!` combine the exact rules that decide which output is valid.

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NEED HELP? Hints

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['Translate every case from the statement into a boolean condition before writing branches.', 'Mentally substitute at least one value for each branch and verify that exactly the intended branch runs.']

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ANSWER Solution

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const fs = require('fs');
const input = fs.readFileSync(0, 'utf8').trimEnd();
let [a, b] = input.trim().split(/\s+/).filter(Boolean).map(Number);
if (((a > 0) && (b > 0)) || ((a < 0) && (b < 0))) {
    console.log("YES");
} else {
    console.log("NO");
}