0_0_18527047_6120.cpp: In function 'int main()': 0_0_18527047_6120.cpp:63:21: error: 'strlen' was not declared in this scope n = strlen(s); ^ 0_0_18527047_6120.cpp:67:34: error: 'memset' was not declared in this scope memset(pos, 0, sizeof pos); ^