Compilare: user.cpp: In function ‘bool verify(std::string, std::string)’: user.cpp:39:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.length(); ++i) ^ user.cpp:45:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pozb == b.length()) ^ user.cpp: In function ‘int main(int, const char**)’: user.cpp:85:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < a.size(); ++i) ^ user.cpp:88:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < sol.size(); ++j) ^ user.cpp:102:35: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘std::vector<std::pair<std::basic_string<char>, int> >::size_type {aka unsigned int}’ [-Wformat=] printf("%lu\n", sol.size()); ^ user.cpp:105:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sol.size(); ++i) ^ user.cpp:55:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interesant.in", "r", stdin); ^ user.cpp:56:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interesant.out", "w", stdout); ^ user.cpp:60:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &c, &n); ^ user.cpp:65:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", str); ^ user.cpp:77:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", str); ^