View Compilation Error

0_0_38416954_29577.cpp: In function 'int main()':
0_0_38416954_29577.cpp:6:15: error: 'scanf' was not declared in this scope
  scanf("%d",&t);
               ^
0_0_38416954_29577.cpp:22:22: error: redeclaration of 'long long int temp'
   long long sum=a[0],temp=0,ma=0;
                      ^
0_0_38416954_29577.cpp:9:13: note: 'long long int temp' previously declared here
   long long temp;
             ^