View Compilation Error

0_0_18352694_10073.cpp: In function 'void ins()':
0_0_18352694_10073.cpp:11:25: error: 'strlen' was not declared in this scope
     int now=1,l=strlen(s);
                         ^
0_0_18352694_10073.cpp: In function 'void solve()':
0_0_18352694_10073.cpp:39:23: error: 'strlen' was not declared in this scope
     int k=1,l=strlen(m);
                       ^