Compilare: user.cpp: In function ‘void make1()’: user.cpp:65:10: warning: unused variable ‘c’ [-Wunused-variable] char c; ^ user.cpp: In function ‘void make2()’: user.cpp:88:10: warning: unused variable ‘c’ [-Wunused-variable] char c; ^ user.cpp: In function ‘int main()’: user.cpp:155:12: warning: unused variable ‘i’ [-Wunused-variable] int T, i; ^ user.cpp:156:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("twosets.in", "r", stdin); ^ user.cpp:157:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("twosets.out", "w", stdout); ^ user.cpp:158:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^ user.cpp:164:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s); ^ user.cpp:166:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s); ^