Compilare: user.cpp: In function ‘void Solve(int)’: user.cpp:42:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( pos != sir.length() ) ^ user.cpp:52:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( pos1 != sir.length() ) ^ user.cpp:30:20: warning: unused variable ‘pos2’ [-Wunused-variable] int pos, pos1, pos2; ^ user.cpp:31:24: warning: unused variable ‘nr2’ [-Wunused-variable] long long int nr1, nr2 = 1, nr3, nr4, c1, c2, val1, val2, numitor = 0; ^ user.cpp:31:51: warning: unused variable ‘val1’ [-Wunused-variable] long long int nr1, nr2 = 1, nr3, nr4, c1, c2, val1, val2, numitor = 0; ^ user.cpp:31:57: warning: unused variable ‘val2’ [-Wunused-variable] long long int nr1, nr2 = 1, nr3, nr4, c1, c2, val1, val2, numitor = 0; ^ user.cpp:32:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp: In function ‘int main()’: user.cpp:146:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(scanf("%d ", &n), nn = n; n > 0; --n) ^ /tmp/cc6rCGJ0.o: In function `Solve(int)': user.cpp:(.text+0x137): warning: the `gets' function is dangerous and should not be used.