Submission #676256

#	Time	Username	Problem	Language	Result	Execution time	Memory
676256		omikron123	Rabbit Carrot (LMIO19_triusis)	C++14	100 / 100	29 ms	3080 KiB

triusis

// https://oj.uz/problem/view/LMIO19_triusis

#include <cstdio>
#include <algorithm>
#include <functional>
#include <vector>
#include <cstring>
using namespace std;
typedef long long ll;

/*
5 400
300 700 200 1000 500
dp[i][j]：到达第i个柱子，调整j个柱子时，能达到的最大的高度。
Slack：
- 100 0 900 -400 900: a[i]+x, a[i]-x，找到最短的区间，使得和大于0？
Maximize # of poles that do not change:
- Find a subsequence where no gap is larger than d*M
- M*i - a[i]，问题就变成了在这个中间寻找LIS
*/

int n, m;
int b[200005];

int main() {
    scanf("%d %d", &n, &m);
    vector<int> dp;     // LIS
    dp.push_back(0);
    for (int i = 1; i <= n; i++) {
        int a;
        scanf("%d", &a);
        int b = m*i - a;
        if (b < 0) continue;

        auto it = upper_bound(dp.begin(), dp.end(), b);
        if (it == dp.end())
            dp.push_back(b);
        else
            *it = b;
    }
    printf("%d", n-dp.size()+1);
    return 0;
}

Compilation message (stderr)

triusis.cpp: In function 'int main()':
triusis.cpp:41:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wformat=]
   41 |     printf("%d", n-dp.size()+1);
      |             ~^   ~~~~~~~~~~~~~
      |              |              |
      |              int            std::vector<int>::size_type {aka long unsigned int}
      |             %ld
triusis.cpp:26:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
triusis.cpp:31:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         scanf("%d", &a);
      |         ~~~~~^~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 21 / 21
• Subtask 3: 28 / 28
• Subtask 4: 37 / 37