atcoder/abc055C

Author: xirc

atcoder/abc055/C/main.cpp

@@ -0,0 +1,22 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+using ll = long long;
+
+ll solve(ll N, ll M) {
+    if (N >= M / 2) {
+        return M / 2;
+    }
+    return N + (M - 2 * N) / 4;
+}
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(0); cout.tie(0);
+
+    ll N, M;
+    cin >> N >> M;
+    cout << solve(N, M) << endl;
+
+    return 0;
+}