0_0_26938434_5491.cpp: In function 'int main()': 0_0_26938434_5491.cpp:19:12: error: expected primary-expression before 'long' #define ll long long ^ 0_0_26938434_5491.cpp:154:10: note: in expansion of macro 'll' ll s = ll(n)*ll(n - 1) / 2ll; ^