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mapped occurrence of each number in column 2

This commit is contained in:
Stedd 2024-12-01 15:22:23 +01:00
parent 7955a35fc2
commit 095ddd091e
1 changed files with 19 additions and 0 deletions
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19
days/day01.cpp
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@ -7,6 +7,7 @@
#include <fstream> #include <fstream>
#include <iostream> #include <iostream>
#include <ostream> #include <ostream>
#include <unordered_map>
#include <vector> #include <vector>
#include <bits/fs_fwd.h> #include <bits/fs_fwd.h>
#include <bits/fs_path.h> #include <bits/fs_path.h>
@ -153,6 +154,7 @@ void day01::Part2()
{ {
std::vector<int> col1; std::vector<int> col1;
std::vector<int> col2; std::vector<int> col2;
std::unordered_map<int, int> occurrence_map;
int sum = 0; int sum = 0;
std::ifstream input("input/day01.txt"); std::ifstream input("input/day01.txt");
@ -176,4 +178,21 @@ void day01::Part2()
col1.emplace_back(std::stoi(line.substr(0, delimiterPos))); col1.emplace_back(std::stoi(line.substr(0, delimiterPos)));
col2.emplace_back(std::stoi(line.substr(delimiterPos + delimiterLength, line.length()))); col2.emplace_back(std::stoi(line.substr(delimiterPos + delimiterLength, line.length())));
} }
for (auto number: col2)
{
if (occurrence_map.contains(number))
{
occurrence_map[number]++;
} else
{
occurrence_map[number] = 1;
}
}
for (auto number: col1)
{
sum += number * occurrence_map[number];
}
printf("Sum of all occurrence pairs is: %d\n", sum);
} }