Submission #961610

#	Time	Username	Problem	Language	Result	Execution time	Memory
961610		steveonalex	A Difficult(y) Choice (BOI21_books)	C++17	100 / 100	1 ms	1368 KiB

books

#include <bits/stdc++.h>
 
#include "books.h"
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define ALL(v) (v).begin(), (v).end()
#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
 
// mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng(1);
ll rngesus(ll l, ll r){return ((ull) rng()) % (r - l + 1) + l;}
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
 
ll LASTBIT(ll mask){return mask & (-mask);}
ll pop_cnt(ll mask){return __builtin_popcountll(mask);}
ll ctz(ll mask){return __builtin_ctzll(mask);}
ll clz(ll mask){return __builtin_clzll(mask);}
ll logOf(ll mask){return 63 - clz(mask);}
 
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;
    }
template <class T>
    void printArr(T& a, string separator = " ", string finish = "\n"){
        for(auto i: a) cout << i << separator;
        cout << finish;
    }
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }
 
 
void solve(int n, int k, long long A, int S) {
    vector<ll> a(n+1);
    for(int i = 1; i<=k-1; ++i) a[i] = skim(i);
    int l = k - 1, r = n;
    while(l < r){
        int mid = (l + r + 1) >> 1;
        a[mid] = skim(mid);
        ll sum = 0;
        for(int i = 1; i<=k-1; ++i) sum += a[i];
        sum += a[mid];
        if (sum <= 2 * A) l = mid;
        else r = mid - 1; 
    }
    int x = l;
 
    if (x == k-1){impossible(); return;}
 
    vector<int> ans;
    for(int i= 1; i<=k-1; ++i) ans.push_back(i); 
    ans.push_back(x);
 
    ll sum = 0;
    for(int i = 1; i<=k-1; ++i) sum += a[i];
    sum += a[l];
    if (sum < A) {
        for(int i = k-2; i>=0; --i){
            if (sum >= A) break;
            int y = ans[i + 1] - 1;
            if (a[y] == 0) a[y] = skim(y);
            if (sum - a[ans[i]] + a[y] <= 2 * A) {sum += a[y] - a[ans[i]];ans[i] = y; continue;}
        }
        if (sum < A) {impossible(); return;}
    }
 
    answer(ans);
}
 
 
// int main(void){
//     ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 
 
//     return 0;
// }

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20