0_0_17017410_7314.cpp:9:11: error: conflicting declaration 'long long int len'
long long len;
^
0_0_17017410_7314.cpp:8:5: note: previous declaration as 'int len'
int len;
^
0_0_17017410_7314.cpp: In function 'int main()':
0_0_17017410_7314.cpp:20:9: error: 'ans' was not declared in this scope
ans=0;
^
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