Submission #1288659

#	Time	Username	Problem	Language	Result	Execution time	Memory
1288659		herominhsteve	Rabbit Carrot (LMIO19_triusis)	C++20	100 / 100	33 ms	4344 KiB

triusis

#include <bits/stdc++.h>
#define el '\n'
#define FNAME "LMIO19_triusis"
#define allof(x) x.begin(),x.end()
#define allof1(x) x.begin()+1,x.end()
#define mset(x,n) memset(x,(n),sizeof(x))
using namespace std;
const long long MOD = (long long) 1e9 + 7;
template<class X,class Y> bool minimize(X &a,Y b){ if (a>b) {a=b; return true;} return false;}
template<class X,class Y> bool maximize(X &a,Y b){ if (a<b) {a=b; return true;} return false;}

void setup(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
	if (fopen(FNAME".inp","r")){
		freopen(FNAME".inp","r",stdin);
		freopen(FNAME".out","w",stdout);
	}
}

template<typename T>
struct FenwickTree{
    int n;
    vector<T> bit;
    FenwickTree(int N=0){
        n=N;
        if (n>0){
            bit.resize(n+1,0);
        }
    }
    void update(int node,T val){
        while (node<=n){
            maximize(bit[node],val);
            node += (node & -node);
        }
    }
    T getVal(int node){
        T res=0;
        while (node>0){
            maximize(res,bit[node]);
            node -= (node & -node);
        }
        return res;
    }
};

int n,m;
vector<int> a;

void init(){
	cin>>n>>m;
    a.resize(n);
    for (int &x : a) cin>>x;        
}

void sol(){
	vector<int> b;
    vector<int> org;
    org.reserve(n);
    for (int i=0;i<n;i++) 
        if ((i+1) * m >= a[i]) org.push_back((i+1) * m - a[i]);
    
    vector<int> compress(allof(org));
    sort(allof(compress));
    compress.resize(unique(allof(compress))-compress.begin());
    int MAX = compress.size();
    b.resize(org.size());
    
    for (int i=0;i<(int)org.size();i++)
        b[i] = lower_bound(allof(compress),org[i]) - compress.begin() + 1;
    
    FenwickTree<int> bit(MAX);
    for (int x : b){
        bit.update(x,bit.getVal(x) + 1);
    }
    cout<< n - bit.getVal(MAX);
}

int main(){
    setup();
    init();
    sol();
}

Compilation message (stderr)

triusis.cpp: In function 'void setup()':
triusis.cpp:16:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |                 freopen(FNAME".inp","r",stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
triusis.cpp:17:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |                 freopen(FNAME".out","w",stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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