Submission #230655

#	Time	Username	Problem	Language	Result	Execution time	Memory
230655		alishahali1382	Split the sequence (APIO14_sequence)	C++14	100 / 100	1056 ms	81908 KiB

sequence

#include <bits/stdc++.h>
#pragma GCC optimize ("O2")
#pragma GCC optimize ("unroll-loops")
//#pragma GCC optimize("no-stack-protector,fast-math")

using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<pii, int> piii;
typedef pair<ll, ll> pll;
#define debug(x) cerr<<#x<<'='<<(x)<<endl;
#define debugp(x) cerr<<#x<<"= {"<<(x.first)<<", "<<(x.second)<<"}"<<endl;
#define debug2(x, y) cerr<<"{"<<#x<<", "<<#y<<"} = {"<<(x)<<", "<<(y)<<"}"<<endl;
#define debugv(v) {cerr<<#v<<" : ";for (auto x:v) cerr<<x<<' ';cerr<<endl;}
#define all(x) x.begin(), x.end()
#define pb push_back
#define kill(x) return cout<<x<<'\n', 0;

const ld eps=1e-7;
const int inf=1000000010;
const ll INF=10000000000000010LL;
const int mod=1000000007;
const int MAXN=100010, LOG=20;

ll n, m, k, u, v, x, y, t, a, b, ans;
ll A[MAXN], ps[MAXN];
ll dp[2][MAXN];
int opt[201][MAXN];
vector<int> out;

inline ll cost(ll l, ll r){ // (l, r]
	return (ps[r]-ps[l])*(ps[r]-ps[l]-1)/2;
}

void divide(int j, int tl, int tr, int optl, int optr){
	if (tr<tl) return ;
	int mid=(tl+tr)>>1;
	for (int i=optl; i<=min(optr, mid-1); i++) if (dp[j&1^1][i]+cost(i, mid)<=dp[j&1][mid]){
		dp[j&1][mid]=dp[j&1^1][i]+cost(i, mid);
		opt[j][mid]=i;
	}
	divide(j, tl, mid-1, optl, opt[j][mid]);
	divide(j, mid+1, tr, opt[j][mid], optr);
}

int main(){
	ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	cin>>n>>k;
	for (int i=1; i<=n; i++) cin>>A[i], ps[i]=ps[i-1]+A[i];
	for (int i=1; i<=n; i++) dp[0][i]=cost(0, i);
	for (int j=1; j<=k; j++){
		memset(dp[j&1], 63, sizeof(dp[j&1]));
		divide(j, 1, n, 1, n);
	}
	
	int pos=n;
	for (int i=k; i; i--){
		pos=opt[i][pos];
		out.pb(pos);
	}
	reverse(all(out));
	cout<<cost(0, n)-dp[k&1][n]<<'\n';
	for (int i:out) cout<<i<<' ';cout<<'\n';
	
	return 0;
}

Compilation message (stderr)

sequence.cpp: In function 'void divide(int, int, int, int, int)':
sequence.cpp:39:53: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
  for (int i=optl; i<=min(optr, mid-1); i++) if (dp[j&1^1][i]+cost(i, mid)<=dp[j&1][mid]){
                                                    ~^~
sequence.cpp:40:20: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   dp[j&1][mid]=dp[j&1^1][i]+cost(i, mid);
                   ~^~
sequence.cpp: In function 'int main()':
sequence.cpp:66:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for (int i:out) cout<<i<<' ';cout<<'\n';
  ^~~
sequence.cpp:66:31: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  for (int i:out) cout<<i<<' ';cout<<'\n';
                               ^~~~

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 17 / 17
• Subtask 5: 21 / 21
• Subtask 6: 29 / 29