Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:19:21: error: ‘strlen’ was not declared in this scope n = strlen(s); ^ user.cpp:46:21: error: ‘strlen’ was not declared in this scope n = strlen(s); ^ user.cpp:11:28: warning: unused variable ‘t’ [-Wunused-variable] long long int x, y, z, t, nrx, nry, nrz, nrt, i, c, a, b, E, n, numar, suma = 0, semn, solutii = 0, expresie, semafor; ^