A walk through problem E from the last club round: the state definition, why the greedy fails, and the O(n) rewrite.
// solution sketch
for (int i = 1; i <= n; i++)
dp[i] = min(dp[i-1] + a[i], best);
cout << dp[n] << '\n';
// O(n) time, O(1) extra spaceFull solutions with complexity notes, including the two approaches people tried for D.
What to learn first, what can wait, and which problems to solve after each topic.
One template that works for both integer and floating-point predicates.
Compile flags, a debug macro that prints containers, and a stress-testing script.
Where constraints usually give away the intended complexity.
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