Compilare: main.cpp: In function 'void write()': main.cpp:25:43: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::size_t {aka long unsigned int}' [-Wformat=] printf("%d\n", (N + 1) / 2 - b.count()); ^ main.cpp: In function 'void read()': main.cpp:11:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ciur.in", "r", stdin); ^ main.cpp:12:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ciur.out", "w", stdout); ^ main.cpp:13:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^