Submission #23630

#	Time	Username	Problem	Language	Result	Execution time	Memory
23630		SYury	Split the sequence (APIO14_sequence)	C++11	33 / 100	9 ms	4564 KiB

sequence

#include<bits/stdc++.h>

using namespace std;
typedef long long lint;
typedef long double ldb;
typedef unsigned long long uli;

#define X first
#define Y second
#define F(i, l, r) for(int i = l; i != r; i++)
#define Df(i, l, r) for(int i = l; i != r; i--)
#define I(i, a) for(auto i : a)
#define pb push_back
#define rs resize
#define mk make_pair
#define asg assign
#define all(x) x.begin(),x.end()
#define ret return
#define cont continue
#define brk break
#define ins insert
#define era erase
#define fi0(x) memset(x, 0, sizeof(x))
#define finf(x) memset(x, 127, sizeof(x))
#define acpy(y, x) memcpy(y, x, sizeof(y))
#define y1 adjf
#define tm dhgdg

const int MAXN = 1e3 + 3;
const int MAXK = 2e2 + 2;

lint dp[MAXN][MAXK];
int pr[MAXN][MAXK];
int a[MAXN];
int ptr[MAXN];
int pref[MAXN];
int n, k;

void restore(int i, int j){
	if(i < 0)ret;
	printf("%d ", i + 1);
	restore(pr[i][j], j - 1);
}

lint f(int j, int pi, int i){
	ret dp[pi][j] + pref[pi] * 1ll * (pref[i] - pref[pi]);
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	scanf("%d%d", &n, &k);
	F(i, 0, n)scanf("%d", &a[i]);
	F(i, 0, n)pref[i] = a[i] + ((i == 0) ? 0 : pref[i - 1]);
	k++;
	F(i, 0, n)
		F(j, 1, k + 1)
			pr[i][j] = -2;
	dp[0][1] = 0;
	pr[0][1] = -1;
	fi0(ptr);
	F(i, 1, n){
		dp[i][1] = 0;
		pr[i][1] = -1;
		F(j, 2, k + 1){
			while(ptr[j - 1] < i - 1 && (pr[ptr[j - 1]][j - 1] == -2 || f(j - 1, ptr[j - 1], i) <= f(j - 1, ptr[j - 1] + 1, i)))ptr[j - 1]++;
			if(pr[ptr[j - 1]][j - 1] == -2)cont;
			dp[i][j] = f(j - 1, ptr[j - 1], i);
			pr[i][j] = ptr[j - 1];
		}
	}
	printf("%lld\n", dp[n - 1][k]);
	restore(pr[n - 1][k], k - 1);
	ret 0;
}

Compilation message (stderr)

sequence.cpp: In function 'int main()':
sequence.cpp:52:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &k);
                       ^
sequence.cpp:53:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  F(i, 0, n)scanf("%d", &a[i]);
                              ^

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 11 / 11
• Subtask 4: 0 / 17
• Subtask 5: 0 / 21
• Subtask 6: 0 / 29