View Compilation Error

0_0_34141080_24357.cpp: In function 'void solve()':
0_0_34141080_24357.cpp:18:27: error: 'strlen' was not declared in this scope
         int len = strlen(s);
                           ^
0_0_34141080_24357.cpp:38:26: error: 'sort' was not declared in this scope
     sort(q + 1, q + n + 1);
                          ^