Compilare: main.cpp: In function 'void df(int)': main.cpp:26:5: warning: unused variable 'i' [-Wunused-variable] int i; ^ main.cpp: In function 'void df2(int)': main.cpp:65:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses] } while(nn>0&&!(a==inf&&b==x||a==x&&b==inf)); ~~~~~~^~~~~~ main.cpp:44:5: warning: unused variable 'i' [-Wunused-variable] int i; ^ main.cpp: In function 'int main()': main.cpp:82:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biconex.in","r",stdin); ^ main.cpp:83:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biconex.out","w",stdout); ^ main.cpp:84:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:86:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^