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#include "aoc.h"
namespace aoc2016 {
static void get_number(const char** pp, int* d) {
const char* p = *pp;
*d = 0;
while (*p >= '0' && *p <= '9') {
*d = *d * 10 + *p - '0';
p++;
}
*pp = p;
}
static void check0(int t, const char* p1, const char* p2, size_t* t1) {
size_t x{0};
while (p1 < p2) {
if (*p1 == '(') {
int d[2] = {0};
int i = 0;
while (*p1 != ')') {
if (*p1 >= '0' && *p1 <= '9') {
get_number(&p1, d + i++);
}
if (*p1 == '(' || *p1 == 'x') {
p1++;
}
}
check0(d[1], p1 + 1, p1 + d[0] + 1, &x);
p1 += d[0] + 1;
} else {
p1++;
x++;
}
}
*t1 += t * x;
}
static void check(const char** pp, int* t0, size_t* t1) {
int d[2] = {0};
const char* p = *pp;
int i = 0;
while (*p != ')') {
if (*p >= '0' && *p <= '9') {
get_number(&p, d + i++);
}
if (*p == '(' || *p == 'x') {
p++;
}
}
*t0 += d[1] * d[0];
check0(d[1], p + 1, p + d[0] + 1, t1);
*pp = p + d[0] + 1;
}
std::pair<int, size_t> day9(line_view file) {
int t0{0};
size_t t1{0};
const char* p1 = file.line;
const char* p2 = p1 + file.length;
while (p1 < p2) {
if (*p1 == '(') {
check(&p1, &t0, &t1);
} else {
if (*p1 != ' ' && *p1 != '\n') {
t0++;
t1++;
}
p1++;
}
}
return {t0, t1};
}
} // namespace aoc2016
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