Compilare: main.cpp: In function 'int main()': main.cpp:43:9: warning: unused variable 'i' [-Wunused-variable] lll i , j , x , y ; ^ main.cpp:43:13: warning: unused variable 'j' [-Wunused-variable] lll i , j , x , y ; ^ main.cpp: In function 'void boost()': main.cpp:17:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("kfib.in", "r", stdin); ^ main.cpp:18:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("kfib.out", "w", stdout); ^