Compilare: user.cpp: In function ‘void write()’: user.cpp:85:9: warning: unused variable ‘Pow’ [-Wunused-variable] int Pow, x, y; ^ user.cpp:85:14: warning: unused variable ‘x’ [-Wunused-variable] int Pow, x, y; ^ user.cpp: In function ‘void read()’: user.cpp:44:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pavare2.in", "r", stdin); ^ user.cpp:45:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n", &n, &a, &b); ^ user.cpp:46:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S); ^ user.cpp: In function ‘void write()’: user.cpp:86:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pavare2.out", "w", stdout); ^ /tmp/cc669G2A.o: In function `read()': user.cpp:(.text+0x184): warning: the `gets' function is dangerous and should not be used.