View Compilation Error

0_0_20579511_19066.cpp: In function 'int main()':
0_0_20579511_19066.cpp:68:23: error: 'strlen' was not declared in this scope
         len=strlen(str);
                       ^
0_0_20579511_19066.cpp: At global scope:
0_0_20579511_19066.cpp:86:1: error: expected unqualified-id before '<' token
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 ^