-
Notifications
You must be signed in to change notification settings - Fork 0
/
sockmerchant
91 lines (67 loc) · 2.24 KB
/
sockmerchant
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
#include <bits/stdc++.h>
using namespace std;
vector<string> split_string(string);
// Complete the sockMerchant function below.
int sockMerchant(int n, vector<int> ar) {
// ar is a vector, dynamically resizing array. n is the number of elements we have
// ar is the socks data
// let's make a map, key is the sock color, value is the number of those socks
std::map<int, int> sockLookup;
for (int i =0; i<n;i++){
if(std::map::count(ar[i]) == 0){
// key isn't in the map, so insert it
sockLookup.insert(std::pair<int, int>(ar[i], 1)); // key is color, val = how many
}
else { // this means key is in it
sockLookup[ar[i]]++; // at the key ar[i] i.e. color, increment it
}
}
// now we have counts, so return how many pairs we have
int sum =0;
for (int i =0; i<n;i++){
// go thru array, lookup, and if val ==2 then add to sum
if (sockLookup[ar[i]] == 2){
sum++;
}
}
return sum;
}
int main()
{
ofstream fout(getenv("OUTPUT_PATH"));
int n;
cin >> n;
cin.ignore(numeric_limits<streamsize>::max(), '\n');
string ar_temp_temp;
getline(cin, ar_temp_temp);
vector<string> ar_temp = split_string(ar_temp_temp);
vector<int> ar(n);
for (int i = 0; i < n; i++) {
int ar_item = stoi(ar_temp[i]);
ar[i] = ar_item;
}
int result = sockMerchant(n, ar);
fout << result << "\n";
fout.close();
return 0;
}
vector<string> split_string(string input_string) {
string::iterator new_end = unique(input_string.begin(), input_string.end(), [] (const char &x, const char &y) {
return x == y and x == ' ';
});
input_string.erase(new_end, input_string.end());
while (input_string[input_string.length() - 1] == ' ') {
input_string.pop_back();
}
vector<string> splits;
char delimiter = ' ';
size_t i = 0;
size_t pos = input_string.find(delimiter);
while (pos != string::npos) {
splits.push_back(input_string.substr(i, pos - i));
i = pos + 1;
pos = input_string.find(delimiter, i);
}
splits.push_back(input_string.substr(i, min(pos, input_string.length()) - i + 1));
return splits;
}