0_0_15096872_7179.cpp: In function 'int main()': 0_0_15096872_7179.cpp:41:33: error: 'memset' was not declared in this scope memset(va, 0, sizeof(va)); ^ 0_0_15096872_7179.cpp:53:13: error: 'pb' was not declared in this scope pb[b[i]] = i; ^