Compilare: user.cpp: In function ‘int main()’: user.cpp:56:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < a.size();i++) ~~^~~~~~~~~~ user.cpp:65:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < a.size() && okk) { ~~^~~~~~~~~~ user.cpp:48:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("laundering.in", "r", stdin); ^ user.cpp:49:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("laundering.out", "w", stdout); ^