cses: add

Author: Pankajcoder1

CSES/Sorting_and_Searching/Sum of Four Values.cpp

@@ -0,0 +1,53 @@
+/*
+    written by Pankaj Kumar.
+    country:-INDIA
+*/
+#include <bits/stdc++.h>
+using namespace std;
+typedef long long ll;
+
+int solve()
+{
+    int n, x;
+    cin >> n >> x;
+    unordered_map<int, pair<int, int>> mp;
+    vector<int> v(n);
+    for (auto &x : v)
+    {
+        cin >> x;
+    }
+    for (int i = 0; i < n; i++)
+    {
+        for (int j = 0; j < i; j++)
+        {
+            int temp_sum = v[i] + v[j];
+            int req_sum = x - temp_sum;
+            if (req_sum <= 0)
+            {
+                continue;
+            }
+            if (mp.find(req_sum) != mp.end())
+            {
+                pair<int, int> t = mp[req_sum];
+                if (t.first != i && t.first != j && t.second != i && t.second != j)
+                {
+                    cout << t.first + 1 << " " << t.second + 1 << " " << i + 1 << " " << j + 1 << endl;
+                    return 0;
+                }
+            }
+            mp[temp_sum] = {i, j};
+        }
+    }
+    cout << "IMPOSSIBLE" << endl;
+    return 0;
+}
+int main()
+{
+    int testCase = 1;
+    // cin>>testCase;
+    while (testCase--)
+    {
+        solve();
+    }
+    return 0;
+}