Compilare: main.cpp: In function 'int main()': main.cpp:34:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < s.size()){ ~~^~~~~~~~~~ main.cpp:37:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i+1 < s.size() && s[i+1] == sgn) i++, nr++; ~~~~^~~~~~~~~~ main.cpp:26:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("semne3.in","r",stdin); ^ main.cpp:27:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("semne3.out","w",stdout); ^