added cses

cses/1094.cpp

@@ -0,0 +1,47 @@
+//URL - https://cses.fi/problemset/task/1094 
+//CSES
+#include <bits/stdc++.h>
+using namespace std;
+
+#ifdef LOCAL
+#define dbg(x) cerr << #x << " = " << x << endl
+#else
+#define dbg(x)
+#endif
+
+#define ll long long
+#define ld long double
+#define ar array
+#define all(x) (x).begin(), (x).end()
+#define sza(x) (int)(x).size()
+
+const ll INF = 1e18;
+const int MOD = 1e9 + 7;
+
+void solve() {
+        ll n;
+        cin>>n;
+        vector<ll>s(n);
+        ll count = 0;
+        for(ll i =0;i<n;i++){
+            cin>>s[i];
+        }
+        for(ll i=1;i<n;i++){
+            ll diff = s[i-1] - s[i];
+            if(diff>0) {
+                count+=diff;
+                s[i] = s[i-1];
+        }
+        }
+        cout<<count;
+}
+
+int main() {
+    ios::sync_with_stdio(false);
+    cin.tie(NULL);
+
+    int tc = 1;
+    // cin >> tc;
+    while(tc--) solve();
+}
+