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max_array_sum.cpp
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max_array_sum.cpp
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#include <bits/stdc++.h>
using namespace std;
vector<string> split_string(string);
int maxSubsetSum(vector<int> arr) {
int u = INT_MIN, v = INT_MIN, w = arr[0];
for(size_t i = 2; i < arr.size(); i++) {
int t = u;
u = max(u, v);
v = max(t, w) + arr[i];
w = max(w, arr[i - 1]);
}
return max(u, v);
}
int main()
{
ofstream fout(getenv("OUTPUT_PATH"));
int n;
cin >> n;
cin.ignore(numeric_limits<streamsize>::max(), '\n');
string arr_temp_temp;
getline(cin, arr_temp_temp);
vector<string> arr_temp = split_string(arr_temp_temp);
vector<int> arr(n);
for (int i = 0; i < n; i++) {
int arr_item = stoi(arr_temp[i]);
arr[i] = arr_item;
}
int res = maxSubsetSum(arr);
fout << res << "\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;
}