atcoder/abc023D (naive)

Author: xirc

atcoder/abc023/D/main.cpp

@@ -0,0 +1,48 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+using ll = int64_t;
+using ff = long double;
+
+int N;
+vector<ll> H, S;
+
+ll solve() {
+    const ll inf = numeric_limits<ll>::max();
+    ll ans = 0;
+    // O(N**2)
+    vector<bool> done(N, false);
+    for (int t = N - 1; t >= 0; --t) {
+        int min_index;
+        ll min_height = inf;
+        for (int i = 0; i < N; ++i) {
+            if (done[i]) continue;
+            ll height = H[i] + t * S[i];
+            bool should_update = 
+                height < min_height ||
+                (height == min_height &&  S[min_index] > S[i]);
+            if (should_update) {
+                min_height = height;
+                min_index = i;
+            }
+        }
+        ans = max(ans, min_height);
+        done[min_index] = true;
+    }
+    return ans;
+}
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(0); cout.tie(0);
+
+    cin >> N;
+    H.assign(N, 0);
+    S.assign(N, 0);
+    for (int i = 0; i < N; i++) {
+        cin >> H[i] >> S[i];
+    }
+    cout << solve() << endl;
+
+    return 0;
+}