View Compilation Error

0_0_26537523_30250.cpp: In function 'int main()':
0_0_26537523_30250.cpp:10:14: error: 'gets' was not declared in this scope
  while(gets(a))
              ^
0_0_26537523_30250.cpp:20:25: error: 'printf' was not declared in this scope
   printf("%d\n",x.size());
                         ^