Compilare: main.cpp: In function 'int main()': main.cpp:21:37: 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 - mark.count()); ^ main.cpp:9:32: 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:10:34: 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:12:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^