This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <string>
#include <map>
#include <math.h>
#include <cmath>
#include <climits>
#include <unordered_map>
#include <unordered_set>
#include <assert.h>
#include <fstream>
#include <bitset>
#include <iomanip>
typedef long long ll;
using namespace std;
int MOD = (int)1e9;
int MAXN = 1e6;
//classes
//global
vector<vector<int>> dp;
int sol(int left, int right, vector<int>& vec){
if(dp[left][right] != -1) return dp[left][right];
else if(left+1 == right) return vec[left] != vec[right];
else if(left == right) return 0;
if(vec[left] == vec[right]) dp[left][right] = sol(left+1, right-1, vec);
else{
vector<int> temp = vec;
temp[left+1] = temp[left+1] + temp[left];
dp[left][right] = 1 + sol(left+1, right, temp);
temp = vec;
temp[right-1] += temp[right];
dp[left][right] = min(dp[left][right], 1 + sol(left, right-1, temp));
}
return dp[left][right];
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
//ifstream fin("input.txt");
//ofstream fout("output.txt");
//stop
int n;
cin >> n;
vector<int> vec(n);
dp.resize(n, vector<int>(n, -1));
for(int& i: vec) cin >> i;
cout << sol(0, n-1, vec) << '\n';
return 0;
}
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