Compilare: user.cpp: In function ‘int main()’: user.cpp:57:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind <= A.length() - 1){ ^ user.cpp:65:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind <= B.length() - 1){ ^ user.cpp:73:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind <= C.length() - 1){ ^ user.cpp:15:9: warning: assuming signed overflow does not occur when assuming that (X - c) <= X is always true [-Wstrict-overflow] if(pos <= sA){ ^ user.cpp:37:9: warning: assuming signed overflow does not occur when assuming that (X - c) <= X is always true [-Wstrict-overflow] if(pos <= sA && !fA[pos]) A[pos] = 9; ^