Compilare: main.cpp: In member function 'bool String::operator<(const String&) const': main.cpp:83:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define for0(i, n) for(int i = 0; i < n; ++i) main.cpp:163:8: for0(i, min(here.size(), other.here.size())) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:163:3: note: in expansion of macro 'for0' for0(i, min(here.size(), other.here.size())) ^~~~ main.cpp:165:22: warning: array subscript has type 'char' [-Wchar-subscripts] if (coresp[here[i]] < coresp[other.here[i]]) return true; ^ main.cpp:165:46: warning: array subscript has type 'char' [-Wchar-subscripts] if (coresp[here[i]] < coresp[other.here[i]]) return true; ^ main.cpp:166:22: warning: array subscript has type 'char' [-Wchar-subscripts] if (coresp[here[i]] > coresp[other.here[i]]) return false; ^ main.cpp:166:46: warning: array subscript has type 'char' [-Wchar-subscripts] if (coresp[here[i]] > coresp[other.here[i]]) return false; ^ main.cpp: In function 'int32_t main()': main.cpp:83:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define for0(i, n) for(int i = 0; i < n; ++i) main.cpp:190:7: for0(i, ord.size()) coresp[ord[i]] = ord.size() - i; ~~~~~~~~~~~~~ main.cpp:190:2: note: in expansion of macro 'for0' for0(i, ord.size()) coresp[ord[i]] = ord.size() - i; ^~~~ main.cpp:190:35: warning: array subscript has type 'char' [-Wchar-subscripts] for0(i, ord.size()) coresp[ord[i]] = ord.size() - i; ^ main.cpp:182:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(PROB_NAME".in", "r", stdin); ^ main.cpp:183:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(PROB_NAME".out", "w", stdout); ^