Submission #736140

#	Time	Username	Problem	Language	Result	Execution time	Memory
736140		marvinthang	Holding (COCI20_holding)	C++17	110 / 110	59 ms	107240 KiB

holding

/*************************************
*    author: marvinthang             *
*    created: 05.08.2022 11:41:13    *
*************************************/

#include <bits/stdc++.h>

using namespace std;

#define                  fi  first
#define                  se  second
#define                 div  ___div
#define                left  ___left
#define               right  ___right
#define                TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define             MASK(i)  (1LL << (i))
#define             FULL(i)  (MASK(i) - 1)
#define           BIT(x, i)  ((x) >> (i) & 1)
#define  __builtin_popcount  __builtin_popcountll
#define        scan_op(...)  istream & operator >> (istream &in, __VA_ARGS__ &u)
#define       print_op(...)  ostream & operator << (ostream &out, const __VA_ARGS__ &u)
#define          file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }

template <class T>             scan_op(vector <T>)  { for (size_t i = 0; i < u.size(); ++i) in >> u[i]; return in; }
template <class T>            print_op(vector <T>)  { out << '{'; for (size_t i = 0; i + 1 < u.size(); ++i) out << u[i] << ", "; if (!u.empty()) out << u.back(); return out << '}'; }
template <class U, class V>   scan_op(pair <U, V>)  { return in >> u.fi >> u.se; }
template <class U, class V>  print_op(pair <U, V>)  { return out << '(' << u.fi << ", " << u.se << ')'; }
template <class A, class B>   inline bool minimize(A &a, B b)  { A eps = 1e-9; if (a > b + eps) { a = b; return true; } return false; }
template <class A, class B>   inline bool maximize(A &a, B b)  { A eps = 1e-9; if (a + eps < b) { a = b; return true; } return false; }

const double PI = 3.1415926535897932384626433832795; // acos(-1.0); atan(-1.0);
const int dir[] = {1, 0, -1, 0, 1, 1, -1, -1, 1}; // {2, 1, -2, -1, -2, 1, 2, -1, 2};
const int MAX = 102;

int N, L, R, K, A[MAX];
int F[MAX][MAX][MAX * MAX / 4];
int fL[MAX][MAX * MAX / 4];
int fR[MAX][MAX * MAX / 4];

void init(void) {
	cin >> N >> L >> R >> K;
	minimize(K, N * N / 4);
	for (int i = 1; i <= N; ++i) cin >> A[i];
}

void process(void) {
	for (int i = L; i <= R; ++i) for (int j = 0; j < L; ++j) for (int k = 0; k <= K; ++k) {
		F[i][j][k] = F[i - 1][j][k] + A[i];
		if (j) {
			minimize(F[i][j][k], F[i][j - 1][k]);
			if (k >= i - j) minimize(F[i][j][k], F[i - 1][j - 1][k - (i - j)] + A[j]);
		}
	}
	for (int i = L - 1; i <= R; ++i) {
		fL[i][0] = F[i][L - 1][0];
		for (int k = 1; k <= K; ++k) fL[i][k] = min(fL[i][k - 1], F[i][L - 1][k]);
	}

	memset(F, 0, sizeof(F));
	for (int i = R; i >= L; --i) for (int j = N + 1; j > R; --j) for (int k = 0; k <= K; ++k) {
		F[i][j][k] = F[i + 1][j][k] + A[i];
		if (j <= N) {
			minimize(F[i][j][k], F[i][j + 1][k]);
			if (k >= j - i) minimize(F[i][j][k], F[i + 1][j + 1][k - (j - i)] + A[j]);
		}
	}
	for (int i = R + 1; i >= L; --i) {
		fR[i][0] = F[i][R + 1][0];
		for (int k = 1; k <= K; ++k) fR[i][k] = min(fR[i][k - 1], F[i][R + 1][k]);
	}

	int res = 1e9;
	for (int i = L - 1; i <= R; ++i)
		for (int k = 0; k <= K; ++k)
			minimize(res, fL[i][k] + fR[i + 1][K - k]);
	cout << res << '\n';
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); // cout.tie(nullptr);
	file("coci1920_r4_holding");
	init();
	process();
	// cerr << "Time elapsed: " << TIME << " s.\n";
	return (0^0);
}

Compilation message (stderr)

holding.cpp: In function 'int main()':
holding.cpp:22:69: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 | #define          file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }
      |                                                             ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
holding.cpp:81:2: note: in expansion of macro 'file'
   81 |  file("coci1920_r4_holding");
      |  ^~~~
holding.cpp:22:103: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 | #define          file(name)  if (fopen (name".inp", "r")) { freopen (name".inp", "r", stdin); freopen (name".out", "w", stdout); }
      |                                                                                               ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
holding.cpp:81:2: note: in expansion of macro 'file'
   81 |  file("coci1920_r4_holding");
      |  ^~~~

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 33 / 33
• Subtask 4: 22 / 22