Compilare: user.cpp: In function ‘void write()’: user.cpp:35:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j = 1, x = 0; ^ user.cpp:35:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j = 1, x = 0; ^ user.cpp:35:19: warning: unused variable ‘x’ [-Wunused-variable] int i, j = 1, x = 0; ^ user.cpp: In function ‘void read()’: user.cpp:8:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("invsort.in", "r", stdin); ^ user.cpp:9:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:12:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^ user.cpp: In function ‘void write()’: user.cpp:36:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("invsort.out", "w", stdout); ^