View Compilation Error

0_0_23819934_16482.cpp:63:9: error: '::main' must return 'int'
 ll main(){
         ^
0_0_23819934_16482.cpp: In function 'int main()':
0_0_23819934_16482.cpp:81:33: error: 'prllf' was not declared in this scope
         prllf("%d\n",shortpath());
                                 ^