View Compilation Error

0_0_16273910_9085.cpp: In function 'int main()':
0_0_16273910_9085.cpp:13:14: error: expression in new-declarator must have integral or enumeration type
   a=new int*[n];  
              ^
0_0_16273910_9085.cpp:15:17: error: expression in new-declarator must have integral or enumeration type
    a[i]=new int[m];
                 ^
0_0_16273910_9085.cpp:17:13: error: expression in new-declarator must have integral or enumeration type
   b=new int[m];
             ^
0_0_16273910_9085.cpp:19:13: error: expression in new-declarator must have integral or enumeration type
   s=new int[n];
             ^