Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:29:38: error: ‘strlen’ was not declared in this scope size_t length = strlen(litere); ^ user.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < length; j++) { ~~^~~~~~~~ user.cpp:33:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int l = j; l < length; l++) { ~~^~~~~~~~