Command Calculator
Medium
Python
Control Flow
10 views
Problem Statement
You will receive q queries of form: op a b, where op is ADD, SUB, MUL, DIV. For DIV, if b is 0 output ERR else output integer division a//b. Output answer for each query on new line.
Input Format
• First line: Integer q (number of queries)
• Next q lines: Each line contains op a b
• op is one of: ADD, SUB, MUL, DIV
• a and b are integers
• Next q lines: Each line contains op a b
• op is one of: ADD, SUB, MUL, DIV
• a and b are integers
Output Format
• For each query, print the result on a new line
• For DIV, if b == 0, print ERR
• For DIV, if b == 0, print ERR
Example
4 ADD 5 3 SUB 10 4 MUL 2 6 DIV 8 2
8 6 12 4
Constraints
• 1 ≤ q ≤ 10^5
• -10^9 ≤ a, b ≤ 10^9
• Integer division should use a // b
• -10^9 ≤ a, b ≤ 10^9
• Integer division should use a // b
Concept Explanation
Queries:
1.ADD 5 3 → 5 + 3 = 8
2.SUB 10 4 → 10 - 4 = 6
3.MUL 2 6 → 2 × 6 = 12
4.DIV 8 2 → 8 // 2 = 4
If a query was DIV 5 0, output would be ERR.
1.ADD 5 3 → 5 + 3 = 8
2.SUB 10 4 → 10 - 4 = 6
3.MUL 2 6 → 2 × 6 = 12
4.DIV 8 2 → 8 // 2 = 4
If a query was DIV 5 0, output would be ERR.
Step-by-Step Explanation
1.Read integer q.
2.Loop q times:
• Read op, a, b.
• If op is ADD, print a + b.
• If op is SUB, print a - b.
• If op is MUL, print a * b.
• If op is DIV:
• If b == 0, print "ERR".
• Otherwise, print a // b.
2.Loop q times:
• Read op, a, b.
• If op is ADD, print a + b.
• If op is SUB, print a - b.
• If op is MUL, print a * b.
• If op is DIV:
• If b == 0, print "ERR".
• Otherwise, print a // b.
Concept Explanation
Queries:
1.ADD 5 3 → 5 + 3 = 8
2.SUB 10 4 → 10 - 4 = 6
3.MUL 2 6 → 2 × 6 = 12
4.DIV 8 2 → 8 // 2 = 4
If a query was DIV 5 0, output would be ERR.
1.ADD 5 3 → 5 + 3 = 8
2.SUB 10 4 → 10 - 4 = 6
3.MUL 2 6 → 2 × 6 = 12
4.DIV 8 2 → 8 // 2 = 4
If a query was DIV 5 0, output would be ERR.
Step-by-Step Explanation
1.Read integer q.
2.Loop q times:
• Read op, a, b.
• If op is ADD, print a + b.
• If op is SUB, print a - b.
• If op is MUL, print a * b.
• If op is DIV:
• If b == 0, print "ERR".
• Otherwise, print a // b.
2.Loop q times:
• Read op, a, b.
• If op is ADD, print a + b.
• If op is SUB, print a - b.
• If op is MUL, print a * b.
• If op is DIV:
• If b == 0, print "ERR".
• Otherwise, print a // b.
Input / Output Format
Input Format
• First line: Integer q (number of queries)
• Next q lines: Each line contains op a b
• op is one of: ADD, SUB, MUL, DIV
• a and b are integers
• Next q lines: Each line contains op a b
• op is one of: ADD, SUB, MUL, DIV
• a and b are integers
Output Format
• For each query, print the result on a new line
• For DIV, if b == 0, print ERR
• For DIV, if b == 0, print ERR
Constraints
• 1 ≤ q ≤ 10^5
• -10^9 ≤ a, b ≤ 10^9
• Integer division should use a // b
• -10^9 ≤ a, b ≤ 10^9
• Integer division should use a // b
Examples
Input:
4
ADD 5 3
SUB 10 4
MUL 2 6
DIV 8 2
Output:
8
6
12
4
Example Solution (Public)
import sysnlines=sys.stdin.read().splitlines()nif not lines or not lines[0].strip():n sys.exit(0)nq=int(lines[0].strip())nout=[]nfor i in range(1,1+q):n parts=(lines[i] if i<len(lines) else '').split()n if len(parts)<3: continuen op=parts[0]n a=int(parts[1]); b=int(parts[2])n if op=='ADD':n out.append(str(a+b))n elif op=='SUB':n out.append(str(a-b))n elif op=='MUL':n out.append(str(a*b))n else:n if b==0:n out.append('ERR')n else:n out.append(str(a//b))nsys.stdout.write('
'.join(out))
Official Solution Code
import sysnlines=sys.stdin.read().splitlines()nif not lines or not lines[0].strip():n sys.exit(0)nq=int(lines[0].strip())nout=[]nfor i in range(1,1+q):n parts=(lines[i] if i<len(lines) else '').split()n if len(parts)<3: continuen op=parts[0]n a=int(parts[1]); b=int(parts[2])n if op=='ADD':n out.append(str(a+b))n elif op=='SUB':n out.append(str(a-b))n elif op=='MUL':n out.append(str(a*b))n else:n if b==0:n out.append('ERR')n else:n out.append(str(a//b))nsys.stdout.write('
'.join(out))
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