View Compilation Error

0_0_21803158_15704.cpp: In function 'int main()':
0_0_21803158_15704.cpp:18:31: error: 'memset' was not declared in this scope
         memset(c1,0,sizeof(c1));
                               ^
0_0_21803158_15704.cpp:21:37: error: expected primary-expression before '<' token
         for(int i=a[0];i<=b[0];i++ )<span style="white-space:pre"> </span>//1
                                     ^
0_0_21803158_15704.cpp:21:38: error: 'span' was not declared in this scope
         for(int i=a[0];i<=b[0];i++ )<span style="white-space:pre"> </span>//1
                                      ^
0_0_21803158_15704.cpp:25:29: error: expected primary-expression before '<' token
         for(int i=1;i<n;i++)<span style="white-space:pre">  </span>//2<span style="white-space:pre"> </span>
                             ^
0_0_21803158_15704.cpp:25:30: error: 'span' was not declared in this scope
         for(int i=1;i<n;i++)<span style="white-space:pre">  </span>//2<span style="white-space:pre"> </span>
                              ^