Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:39:26: error: ‘strlen’ was not declared in this scope for (i = 0, N = strlen(A); i < N; ++i) P[0][i] = A[i]; ^ user.cpp:34:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ghicit.in", "r", stdin); ^ user.cpp:35:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ghicit.out", "w", stdout); ^ user.cpp:38:9: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(A); ^