Compilare: main.cpp: In function 'int main()': main.cpp:68:27: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::unordered_map<long long int, long long int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", mp.size()); ^ main.cpp:32:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.in", "r", stdin); ^ main.cpp:33:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.out", "w", stdout); ^ main.cpp:35:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &b); ^