Compilare: main.cpp: In function 'int next_int(FILE*)': main.cpp:31:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses] while (x>=48 && x<=57 || x=='-') ~~~~~~^~~~~~~~ main.cpp:12:12: warning: variable 'y' set but not used [-Wunused-but-set-variable] char x,y,k=1; ^ main.cpp: In function 'int main(int, const char**)': main.cpp:100:33: 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:101:35: 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); ^