Compilare: main.cpp: In function 'bool canGet(long long int, std::string)': main.cpp:19:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for(int i=0;i<s.size();++i) | ~^~~~~~~~~ main.cpp:26:32: warning: array subscript has type 'char' [-Wchar-subscripts] 26 | int suma = sum[s[i]][mij] - sum[s[i]][Start-1]; | ^ main.cpp:26:49: warning: array subscript has type 'char' [-Wchar-subscripts] 26 | int suma = sum[s[i]][mij] - sum[s[i]][Start-1]; | ^ main.cpp: In function 'void solve()': main.cpp:76:13: warning: array subscript has type 'char' [-Wchar-subscripts] 76 | sum[x][i]++; | ^ main.cpp: At global scope: main.cpp:94:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 94 | main() | ^~~~