Help me in solving MAXSCORE7 problem

help
,
1

My issue

why is this code wrong?

My code

# cook your dish here
for _ in range(int(input())):
    n=int(input())
    a=input()
    c1,c2=0,0
    for i in a:
        if i=="0":
            c1+=1 
        else:
            c2+=1 
    print(min(c1,c2))

Problem Link: Maximum Score Practice Coding Problem - CodeChef

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