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Author: BrandonTang89

Other_Tasks/CF2067_C_Devyatkino.cpp

@@ -0,0 +1,48 @@
+#pragma GCC optimize("Ofast")
+#pragma GCC optimize("unroll-loops")
+#include <bits/stdc++.h>
+using namespace std;
+
+typedef long long ll;
+#define fast_cin()                    \
+    ios_base::sync_with_stdio(false); \
+    cin.tie(NULL);                    \
+    cout.tie(NULL);
+
+ll best;
+void can(ll n, ll j) {
+    for (ll i = 0; i <= 6; i++) {
+        ll x = n + i * j;
+        while (x) {
+            if (x % 10 == 7) {
+                best = min(best, i);
+                return;
+            };
+            x /= 10;
+        }
+    }
+}
+
+int main() {
+    fast_cin();
+    int tc;
+    cin >> tc;
+    while (tc--) {
+        ll n;
+        cin >> n;
+        best = 7;
+
+        can(n, 9LL);
+        can(n, 99LL);
+        can(n, 999LL);
+        can(n, 9999LL);
+        can(n, 99999LL);
+        can(n, 999999LL);
+        can(n, 9999999LL);
+        can(n, 99999999LL);
+        can(n, 999999999LL);
+        cout << best << endl;
+    }
+
+    return 0;
+}