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#include <stdlib.h>
// assumes endptr != NULL
// doesn't check for sign
// doesn't check for base-prefix
long long int strtoll(const char *nptr, char **endptr, int base) {
long long val = 0;
for (; *nptr; nptr++) {
int v = *nptr;
if ('0' <= v && v <= '9') {
v -= '0';
} else if ('A' <= v && v <= 'Z') {
v -= 'A' - 10;
} else if ('a' <= v && v <= 'z') {
v -= 'a' - 10;
} else {
break;
}
if (v >= base) {
break;
}
val = val * base + v;
}
*endptr = (char*)nptr;
return val;
}