Created
March 30, 2024 21:53
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sorted_sum.cpp
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| #include <algorithm> | |
| #include <iostream> | |
| #include <string> | |
| #include <utility> | |
| #include <vector> | |
| using namespace std; | |
| // assuming array K first elements are sorted, sort so that K+1 becomes | |
| // sorted. | |
| void sort_n(vector<int> &a, int k) { | |
| // insertion sort this. | |
| int j = k; | |
| while (a[j] < a[j - 1]) { | |
| auto t = a[j - 1]; | |
| a[j - 1] = a[j]; | |
| a[j] = t; | |
| j--; | |
| } | |
| } | |
| unsigned long long sorted_sum(vector<int> a) { | |
| unsigned R = 0; | |
| for (int i = 0; i < a.size(); ++i) { | |
| sort_n(a, i); | |
| for (size_t j = 0; j < i + 1; ++j) { | |
| R = (R + ((a[j] * (j + 1)) % 1000000007)) % 1000000007; | |
| } | |
| } | |
| return R; | |
| } | |
| int main() { cout << sortedSum({9, 5, 8}) << "\n"; } |
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