Compilare: main.cpp: In function 'int main()': main.cpp:127:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp:10:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] #define FO(x) {freopen(#x".in","r",stdin);freopen(#x".out","w",stdout);} ^ main.cpp:101:9: note: in expansion of macro 'FO' FO(paranteze) ^~ main.cpp:10:71: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] #define FO(x) {freopen(#x".in","r",stdin);freopen(#x".out","w",stdout);} ^ main.cpp:101:9: note: in expansion of macro 'FO' FO(paranteze) ^~