Submission #1304120

#	Time	Username	Problem	Language	Result	Execution time	Memory
1304120		dex111222333444555	Rabbit Carrot (LMIO19_triusis)	C++20	100 / 100	23 ms	2364 KiB

triusis

#include <bits/stdc++.h>
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define ii pair<int, int>
#define fi first
#define se second
#define all(v) begin(v), end(v)
#define siz(v) (int)(v).size()
using namespace std;

const int MAXN = 2e5 + 4, mod = 1e9 + 7, MAXB = 20;

template<class X, class Y> bool minimize(X &x, const Y &y){return x > y ? x = y, 1: 0;}
template<class X, class Y> bool maximize(X &x, const Y &y){return x < y ? x = y, 1: 0;}

void add(int &a, const int &b){
    a += b;
    if (a >= mod) a -= mod;
}

void sub(int &a, const int &b){
    a -= b;
    if (a < 0) a += mod;
}

int mul(const int &a, const int &b){
    return 1LL * a * 1LL * b % mod;
}

int numHeight, height[MAXN], change;
bool mark[MAXN];

void input(){
    cin >> numHeight >> change;
    for(int i = 1; i <= numHeight; i++) cin >> height[i];
}

void solve(){
    vector<int> lis;
    for(int i = numHeight; i >= 1; i--){
        vector<int>::iterator it = upper_bound(all(lis), height[i] - i * change);
        if (it == end(lis)) lis.push_back(height[i] - i * change);
        else *it = height[i] - i * change;
    }
    cout << numHeight - (upper_bound(all(lis), 0) - begin(lis)) << '\n';
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #define task "test"
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    input();
    solve();
}

Compilation message (stderr)

triusis.cpp: In function 'int main()':
triusis.cpp:52:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
triusis.cpp:53:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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