Compilare: main.cpp:6:30: warning: suggest parentheses around '+' inside '<<' [-Wparentheses] int n,m,x,y,i,buff_size=1<<15+1,pos,nr; ~~^~ main.cpp:7:16: warning: suggest parentheses around '+' inside '<<' [-Wparentheses] char buff[1<<15+1]; ~~^~ main.cpp: In function 'int main()': main.cpp:35:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.in","r",stdin); ^ main.cpp: In function 'void read(int&)': main.cpp:12:54: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1,buff_size, stdin), pos = 0; ^ main.cpp:18:54: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, buff_size, stdin), pos = 0; ^