P2141 [NOIP2014 普及组] 珠心算测验

R63301836

Luogu/P2141/P2141.cpp

@@ -0,0 +1,26 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int n, a[105], ans;
+bool vis[105];
+
+int main() {
+    cin >> n;
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i];
+    }
+    sort(a + 1, a + 1 + n);
+    for (int i = 1; i < n - 1; i++) {
+        for (int j = i + 1; j < n; j++) {
+            for (int k = j + 1; k <= n; k++) {
+                if (a[i] + a[j] == a[k] && !vis[k]) {
+                    ans++;
+                    vis[k] = true;
+                }
+            }
+        }
+    }
+    cout << ans << endl;
+    return 0;
+}