CF1154G Minimum Possible LCM

https://www.luogu.com.cn/record/76270218

Luogu/CF1154G/CF1154G.cpp

@@ -0,0 +1,55 @@
+#include <iostream>
+#include <limits>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e7 + 5;
+
+int n, pos[N], x, y;
+long long ans = std::numeric_limits<long long>::max();
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> n;
+
+    for (int i = 1, t; i <= n; i++) {
+        cin >> t;
+
+        if (pos[t] && t < ans) {
+            ans = t;
+            x = pos[t];
+            y = i;
+        }
+
+        pos[t] = i;
+    }
+
+    for (int i = 1; i <= 1e7; i++) {
+        int t = 0;
+
+        for (int j = i; j <= 1e7; j += i) {
+            if (!pos[j]) continue;
+
+            if (!t) {
+                t = j;
+            } else {
+                long long lcm = 1ll * t * j / i;
+
+                if (lcm < ans) {
+                    ans = lcm;
+                    x = pos[t];
+                    y = pos[j];
+                }
+
+                break;
+            }
+        }
+    }
+
+    cout << std::min(x, y) << ' ' << std::max(x, y) << endl;
+
+    return 0;
+}