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| #include <string> | |
| #include <iostream> | |
| #include <map> | |
| #include <vector> | |
| #include <cctype> | |
| int to_int(int c) { | |
| if (! isxdigit(c)) return -1; // error: non-hexadecimal digit found | |
| if (isdigit(c)) return c - '0'; | |
| if (isupper(c)) c = tolower(c); |