Submission #1031605

#	Time	Username	Problem	Language	Result	Execution time	Memory
1031605		Phuoc	Stove (JOI18_stove)	C++14	0 / 100	1 ms	412 KiB

stove

#include <bits/stdc++.h>
#include <iostream>
#include <cmath>
#include <iomanip>
#include <vector>
#include <map>
#include <stack>
#include <queue>
 
using namespace std;
 
#define ll long long
#define pb push_back
#define el '\n'
#define mpair make_pair
#define MASK(i) (1LL << (i))
#define BIT(mask, i) (((mask) >> (i)) & 1)
#define fi first
#define se second
 
/* Author: Pham Gia Phuoc */
 
const int MOD = (int)(1e9) + 7;
 
template <class T1, class T2>
    void add(T1 &a, T2 b){
        a += b;
        if(a >= MOD) a -= MOD;
    }
 
template <class T1, class T2>
    void sub(T1 &a, T2 b){
        a -= b;
        if(a < 0) a += MOD;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if(a > b){a = b; return true;} return false;
    }
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if(a < b){a = b; return true;} return false;
    }
 
/** END OF TEMPLATE. DRINK A CUP OF COFFEE BEFORE READING MY CODE **/
 
const int MAX = 100010;
const ll INF = (ll) 1e18 + 67LL;
const int oo = (int)(1e9 + 7);
const int NUM_BIT = 62;
 
int N, K, t[MAX];
 
void init(){
    cin >> N >> K;
    for(int i = 1; i <= N; i++) cin >> t[i];
}
 
bool checkSubtask1(){
    if(N > 20) return false;
    for(int i = 1; i <= N; i++) if(t[i] > 20) return false;
    return true;
}
 
void solveSubtask1(){
    ll ans = INF;
    for(int mask = 0; mask < MASK(N); mask++) if(__builtin_popcount(mask) <= K - 1) {
        ll cur = 0;
        int pre = 1;
        for(int i = 2; i <= N; i++) if(BIT(mask, i - 1)) {
            cur += (t[i - 1] + 1 - t[pre]);
            pre = i;
        }
        cur += (t[N] + 1 - t[pre]);
        minimize(ans, cur);
    }
    cout << ans << el;
}

void solveSubtask3(){
    ll ans = t[N] - t[1] + 1;
    vector <ll> b;
    for(int i = 2; i < N; i++) b.push_back(t[i + 1] - (t[i] + 1));
    sort(b.begin(), b.end(), greater <int>());
    for(int i = 0; i < K - 1; i++){
        ans -= b[i];
    }
    cout << ans;
}
 
void solve(){
    // if(checkSubtask1()){solveSubtask1(); return;}
    solveSubtask3();
}
 
int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #define test "test"
    int t = 1;
    while(t--){
        init();
        solve();
    }
    
    return 0;
}
 
 
 
/*** ROAD TO VOI 2024 ***/

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50