P1590 失踪的7 [70' Code]

R38866815

problem/P1590/P1590.cpp

@@ -0,0 +1,31 @@
+// 70' Code (R38866815)
+
+#include <bits/stdc++.h>
+
+using namespace std;
+
+bool find(int s, int x) {
+    while (s) {
+        if (s % 10 == x) {
+            return true;
+        }
+        s /= 10;
+    }
+    return false;
+}
+
+int main() {
+    int t, n, ans;
+    cin >> t;
+    for (int i = 0; i < t; i++) {
+        cin >> n;
+        ans = 0;
+        for (int i = 1; i <= n; i++) {
+            if (!find(i, 7)) {
+                ans++;
+            }
+        }
+        cout << ans << endl;
+    }
+    return 0;
+}