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Advent2021/Day 6/Marcus/cpp/part2.cpp

34 lines
655 B
C++

#include <iostream>
using namespace std;
int main()
{
int next_fish;
unsigned long long fish[9] = {0};
for(int i = 0; i < 300; i++)
{
cin >> next_fish;
fish[next_fish]++;
}
unsigned long long total_fish = 300;
for(int i = 0; i < 256; i++)
{
unsigned long long spawning_fish = fish[0];
total_fish += spawning_fish;
for(int j = 1; j < 9; j++)
{
fish[j-1] = fish[j];
}
fish[6] += spawning_fish;
fish[8] = spawning_fish;
}
cout << total_fish << endl;
return 0;
}