Compilare: main.cpp: In function 'int main()': main.cpp:29:13: warning: unused variable 'cnt' [-Wunused-variable] int s = 0,cnt = 0; ^~~ main.cpp:30:8: warning: unused variable 'ok' [-Wunused-variable] bool ok = false; ^~ main.cpp:17:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("peri.in","r",stdin); ^ main.cpp:18:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("peri.out","w",stdout); ^ main.cpp: In function 'void Next()': main.cpp:75:44: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] std::fread(s, 1, Lim, stdin), u = 0; ^