Compilare: user.cpp: In function ‘void Solve()’: user.cpp:55:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( p[l] >= pos[ l ].size() ) ^ user.cpp: In function ‘void Set()’: user.cpp:37:17: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S1 + 1); ^ user.cpp:38:17: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S2 + 1); ^ /tmp/ccNQh9Kp.o: In function `Set()': user.cpp:(.text+0x1d3): warning: the `gets' function is dangerous and should not be used.