Compilare: user.cpp: In function ‘int main()’: user.cpp:20:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<=strlen(v)-1; i++) ^ user.cpp:16:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,k,NR,t=0,w; ^ user.cpp:16:20: warning: unused variable ‘t’ [-Wunused-variable] int i,j,x,k,NR,t=0,w; ^ user.cpp:16:24: warning: unused variable ‘w’ [-Wunused-variable] int i,j,x,k,NR,t=0,w; ^ user.cpp:13:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reteta.in", "r", stdin); ^ user.cpp:14:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reteta.out", "w", stdout); ^