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 <bits/stdc++.h>
using namespace std;
#define N 300000
#define INF ((long long) 300000 * 1000000000)
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);
for (int i = 1; i <= n; ++i)
scanf("%d", a + i);
auto check = [&](long long penalty) {
dp[0][0] = {0, 0}, dp[0][1] = {-INF, 0};
for (int i = 1; i <= n; ++i) {
dp[i][0] = max(dp[i - 1][0], dp[i - 1][1]);
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, INF, check);
check(penalty);
printf("%lld\n", (long long) penalty * k + max(dp[n][0], dp[n][1]).first);
}
Compilation message (stderr)
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:21:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
21 | scanf("%d", a + i);
| ~~~~~^~~~~~~~~~~~~
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