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Submission #439907

# Submission time Handle Problem Language Result Execution time Memory
439907 2021-07-01T07:30:54 Z dongliu0426 Feast (NOI19_feast) C++14
0 / 100
 143 ms 13756 KB 
#include <bits/stdc++.h>
using namespace std;

#define N	300000
#define INF	0x3f3f3f3f3f3f3f3f

int n, k, a[N + 1];
pair<long long, int> dp[N + 1][2];

template<class T, class U> T lastTrue(T lo, T hi, U f) {
	assert(lo <= hi); --lo; /* assuming f is decreasing */
	while (lo < hi) { /* find last index such that f is true */
		T mid = lo + (hi - lo + 1) / 2;
		f(mid) ? lo = mid : hi = mid - 1;
	} return lo;
}

int main() {
	scanf("%d%d", &n, &k);
	long long sum = 0;
	for (int i = 1; i <= n; ++i)
		scanf("%d", a + i), sum += a[i];
	auto check = [&](long long penalty) {
		dp[0][0] = {0, 0}, dp[0][1] = {-INF, 0};
		for (int i = 1; i <= n; ++i) {
			pair<long long, int> last = max(dp[i - 1][0], dp[i - 1][1]);
			dp[i][0] = max(make_pair(last.first - penalty, last.second + 1), last);
			dp[i][1] = max(make_pair(dp[i - 1][1].first + a[i], dp[i - 1][1].second),
				make_pair(dp[i - 1][0].first + a[i] - penalty, dp[i - 1][0].second + 1));
		}
		return max(dp[n][0], dp[n][1]).second >= k;
	};
	long long penalty = lastTrue<long long>(0, *max_element(a + 1, a + n + 1), check);
	check(penalty);
	printf("%lld\n", max(dp[n][0], dp[n][1]).first + penalty * k);
}

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:19:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |  scanf("%d%d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~
feast.cpp:22:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |   scanf("%d", a + i), sum += a[i];
      |   ~~~~~^~~~~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 122 ms 13384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 60 ms 11592 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 143 ms 13756 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 122 ms 13384 KB Output isn't correct
2 Halted 0 ms 0 KB -