Compilare: main.cpp: In function 'int main()': main.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < Sol.size() - 1 ; ++i) if(Sol[i] == 0) ++n_sol; ~~^~~~~~~~~~~~~~~~ main.cpp:61:29: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d ", grup.size()); ^ main.cpp:12:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("johnie.in", "r", stdin); ^ main.cpp:15:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:18:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^