0_0_13670283_18762.cpp: In function 'void solve()': 0_0_13670283_18762.cpp:6:38: error: 'memset' was not declared in this scope #define CLR(a) memset(a, 0, sizeof(a)) ^ 0_0_13670283_18762.cpp:87:1: note: in expansion of macro 'CLR' CLR(vis); ^