Compilare: user.cpp: In function ‘int main()’: user.cpp:40:23: warning: unused variable ‘k’ [-Wunused-variable] int n,m,i,j,ind,nr,x,k; ^ user.cpp:42:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("litere2.in","r",stdin); ^ user.cpp:44:9: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(c); ^ /tmp/cc1WewZK.o: In function `main': user.cpp:(.text.startup+0x6b): warning: the `gets' function is dangerous and should not be used.