#12. 分配

https://sjzezoj.com/submission/21493

S2OJ/12/12.cpp

@@ -0,0 +1,26 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int t;
+long long n, s;
+
+int main() {
+    cin >> t;
+    while (t--) {
+        cin >> n >> s;
+        if (s) {
+            cout << (n + 1 >> 1) << endl;
+        } else if (n & 1) {
+            cout << (n >> 1) << endl;
+        } else {
+            for (int i = 1; i <= 30; i++) {
+                if ((1ll << (i - 1)) <= n && n < (1ll << i)) {
+                    cout << ((n - (1ll << i - 1)) >> 1) << endl;
+                    break;
+                }
+            }
+        }
+    }
+    return 0;
+}