0_0_30343603_1737.cpp: In function 'void first()': 0_0_30343603_1737.cpp:5:39: error: 'memset' was not declared in this scope #define ZERO(x) memset(x, 0, sizeof(x)) ^ 0_0_30343603_1737.cpp:36:3: note: in expansion of macro 'ZERO' ZERO(mp); ^