0_0_18016410_9316.cpp: In function 'int main()': 0_0_18016410_9316.cpp:5:42: error: 'memset' was not declared in this scope #define cls(x) memset(x, false, sizeof(x)) ^ 0_0_18016410_9316.cpp:34:9: note: in expansion of macro 'cls' cls(map); ^