View Compilation Error

0_0_13969045_13311.cpp: In function 'int main()':
0_0_13969045_13311.cpp:23:19: error: 'sort' was not declared in this scope
         sort(s,s+4);
                   ^
0_0_13969045_13311.cpp:26:15: error: invalid types 'int[int]' for array subscript
         if(a[3]>a[0]+a[1]+a[2])
               ^
0_0_13969045_13311.cpp:26:20: error: invalid types 'int[int]' for array subscript
         if(a[3]>a[0]+a[1]+a[2])
                    ^
0_0_13969045_13311.cpp:26:25: error: invalid types 'int[int]' for array subscript
         if(a[3]>a[0]+a[1]+a[2])
                         ^
0_0_13969045_13311.cpp:26:30: error: invalid types 'int[int]' for array subscript
         if(a[3]>a[0]+a[1]+a[2])
                              ^