Compilare: user.cpp: In function ‘void sol()’: user.cpp:131:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘int main()’: user.cpp:155:6: warning: unused variable ‘i’ [-Wunused-variable] {int i, j; ^ user.cpp:155:9: warning: unused variable ‘j’ [-Wunused-variable] {int i, j; ^ user.cpp: In function ‘void sol()’: user.cpp:139:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^ user.cpp: In function ‘int main()’: 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("revolta.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("revolta.out", "w", stdout); ^