View Compilation Error

0_0_36567952_20159.cpp:12:16: error: '::main' must return 'int'
 long long main() {
                ^
0_0_36567952_20159.cpp: In function 'int main()':
0_0_36567952_20159.cpp:21:33: error: expected primary-expression before 'long'
             columnmn[i].value = long long_MAX;
                                 ^