Submission #627097

#TimeUsernameProblemLanguageResultExecution timeMemory
627097NothingXDLiteh and Newfiteh (INOI20_litehfiteh)C++14
30 / 100
148 ms230704 KiB
#include<bits/stdc++.h> using namespace std; typedef long long ll; typedef long double ld; typedef unsigned long long ull; typedef pair<int,int> pii; typedef pair<ll,ll> pll; void debug_out() { cerr << endl; } template <typename Head, typename... Tail> void debug_out(Head H, Tail... T) { cerr << " " << H; debug_out(T...); } #define debug(...) cerr << "(" << #__VA_ARGS__ << "):", debug_out(__VA_ARGS__) #define all(x) x.begin(), x.end() #define MP(x, y) make_pair(x, y) #define F first #define S second const int MAXN = 1e5 + 10; const int LOG = 17; const int INF = 1e9; int n, a[MAXN], dp[LOG][LOG][MAXN], ans[MAXN]; int main(){ ios_base::sync_with_stdio(false); cin.tie(0); memset(dp, 63, sizeof dp); memset(ans, 63, sizeof ans); debug(2*ans[0]+1); cin >> n; for (int i = 1; i <= n; i++){ cin >> a[i]; dp[0][a[i]][i] = 0; if (a[i]) dp[0][a[i]-1][i] = 1; } for (int i = 1; i < LOG; i++){ for (int j = 0; j < LOG; j++){ for (int k = 1; k + (1 << i) - 1 <= n; k++){ dp[i][j][k] = min({dp[i][j][k], dp[i-1][j][k] + dp[i-1][j][k + (1 << (i-1))], dp[i-1][j+1][k] + dp[i-1][j+1][k + (1 << (i-1))] + 1}); } } } ans[n+1] = 0; for (int i = n; i; i--){ for (int j = 0; i + (1 << j) - 1 <= n; j++){ ans[i] = min(ans[i], dp[j][0][i] + ans[i + (1 << j)]); } } cout << (ans[1] >= INF? -1: ans[1]) << '\n'; }
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