Compilare: user.cpp: In function ‘int main()’: user.cpp:120:20: warning: unused variable ‘x’ [-Wunused-variable] int i,n,len2=0,x,j; ^ user.cpp:120:22: warning: unused variable ‘j’ [-Wunused-variable] int i,n,len2=0,x,j; ^ user.cpp:122:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("pal2.in","r",stdin); ^ user.cpp:123:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("pal2.out","w",stdout); ^ user.cpp:124:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", (a+1)); ^ user.cpp: In function ‘void ZAlg(char*, int)’: user.cpp:77:16: warning: ‘M’ may be used uninitialized in this function [-Wmaybe-uninitialized] t=2*M-i; L=2*M-R; ^