Submission #933782

#	Time	Username	Problem	Language	Result	Execution time	Memory
933782		berr	A Difficult(y) Choice (BOI21_books)	C++17	0 / 100	1 ms	1112 KiB

books

#include"books.h"
#include <bits/stdc++.h>
using namespace std;

vector<long long> vis;
int flag=1, a;
long long s(int a){
    if(vis[a]!=-1) return vis[a];
    else return vis[a] = skim(a+1); 
}

void ans(int left, int right, int extra){
    vector<int> a;
    for(int i=1; i<=left; i++) a.push_back(i);
    for(int i=vis.size(); i>vis.size()-right; i--) a.push_back(i);
    if(extra!=-1)a.push_back(extra);

    sort(a.begin(), a.end());
    answer(a);
}

void get(int l, int r, long long tsum){
    int k = l; long long sum=0;
    for(int i=0; i<l; i++) sum+=s(i);
    for(int i=vis.size()-1; i>vis.size()-r; i--) sum+=s(i);

    for(int j=17; j>=0; j--){
        int tmp = k+(1<<j);
        if(tmp>=vis.size()||tmp>=vis.size()-r) continue;
        if(s(tmp)+sum <= 2*a) k= tmp;
    }
    flag = 0;
    if(k<vis.size()-r&&sum+s(k) <=2*a && sum+s(k) >=a) ans(l, r, k);
    return impossible();

}

void solve(int N, int K, long long A, int S) {
    vis.resize(N+1, -1LL);
    a = A;
    long long sum=0;
    int l, r;
    for(int i=0; i<K; i++) sum+=(long long)s(i);
    for(int i=N-1; i>=N-K; i--) s(i);
    l=K; r=0;
    
    if(sum>2*A) return impossible();
    else if(sum>=A) ans(l, r, -1);
    else{

        for(int i=0; i<K&&flag; i++){
            l--; r++;
            long long tsum=sum;
            sum-=s(K-1-i); sum+=s(N-i-1);
            if(sum>2*A) get(l-1, r-1, tsum);
            else if(sum>=A) ans(l, r, -1);
        }

        if(flag) impossible();
    }


}

Compilation message (stderr)

books.cpp: In function 'void ans(int, int, int)':
books.cpp:16:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for(int i=vis.size(); i>vis.size()-right; i--) a.push_back(i);
      |                           ~^~~~~~~~~~~~~~~~~
books.cpp: In function 'void get(int, int, long long int)':
books.cpp:26:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |     for(int i=vis.size()-1; i>vis.size()-r; i--) sum+=s(i);
      |                             ~^~~~~~~~~~~~~
books.cpp:30:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |         if(tmp>=vis.size()||tmp>=vis.size()-r) continue;
      |            ~~~^~~~~~~~~~~~
books.cpp:30:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |         if(tmp>=vis.size()||tmp>=vis.size()-r) continue;
      |                             ~~~^~~~~~~~~~~~~~
books.cpp:34:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     if(k<vis.size()-r&&sum+s(k) <=2*a && sum+s(k) >=a) ans(l, r, k);
      |        ~^~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20