Compilare: main.cpp: In function 'void solve()': main.cpp:52:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<strlen(s); i++) ~^~~~~~~~~~ main.cpp: In function 'void onScreen()': main.cpp:10:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tastatura.in", "r", stdin); ^ main.cpp:11:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tastatura.out", "w", stdout); ^