CF 797, got stuck on E and had to leave, went pretty well

codeforces/rounds/797/b.cpp

@@ -0,0 +1,66 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+void test_case(int tc){
+    int n;
+    cin >> n;
+
+    vector<int> a(n);
+    vector<int> b(n);
+
+    for (size_t i = 0; i < n; i++){
+        cin >> a[i];
+    }
+
+    for (size_t i = 0; i < n; i++){
+        cin >> b[i];
+    }
+
+    bool result = true;
+
+    int exactdif = INT32_MAX;
+    int hightestdif = 0;
+    bool onlyzeroes = true;
+
+    for(size_t i = 0; i < n; ++i){
+        auto ax = a[i], bx = b[i];
+        auto d = ax - bx;
+
+        if(bx == 0){
+            hightestdif = max(hightestdif, d);
+        } else {
+            onlyzeroes = false;
+            if(exactdif == INT32_MAX){
+                exactdif = d;
+            } else if(exactdif != d){
+                result = false;
+                break;
+            }
+        }
+    }
+
+    if(hightestdif > exactdif){
+        result = false;
+    }
+    
+    cout << (result || onlyzeroes ? "YES" : "NO") << '\n';
+}
+
+
+
+int main(){
+    ios::sync_with_stdio(0);
+    cin.tie(0);
+
+    int t;
+    cin >> t;
+
+    for(int tc = 1; tc <= t; ++tc){
+        test_case(tc);
+    }
+
+    cout << flush;
+
+    return 0;
+}