0_0_13490861_11666.cpp: In function 'int main()':
0_0_13490861_11666.cpp:37:24: error: 'len1' was not declared in this scope
for(int i=0;i<=len1;i++)
^
0_0_13490861_11666.cpp:39:23: error: 'len2' was not declared in this scope
for(int i=0;i<=len2;i++)
^
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