Compilare: user.cpp: In function ‘std::string div(std::string)’: user.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.length(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:105:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i1 < s1.size() && i2 < s2.size()) { ^ user.cpp:105:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i1 < s1.size() && i2 < s2.size()) { ^ user.cpp:90:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("easylca.in","r",stdin); ^ user.cpp:91:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("easylca.out","w",stdout); ^ user.cpp:98:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &t); ^ user.cpp:100:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s %s ", aa, bb); ^