basicbinary Batch , stdin/stdout

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Problem Description

Given a number represented in binary, print out the number represented in base 10 (decimal).

The only input would be the number represented in binary.

The number would be positive and smaller than 2³¹ in all testcases.

A single number, which is the number represented in base 10 (decimal).

Subtask	Score	#TC	Time	Memory	Scoring
1	100	10	1s	32MB	Average
2	0	1	1s	32MB	Average

g++-7 ans.cpp -o basicbinary -Wall -static -O2 -lm -m64 -s -w -std=gnu++17 -fmax-errors=512