Submission #1334293

#	Time	Username	Problem	Language	Result	Execution time	Memory
1334293		enson	A Difficult(y) Choice (BOI21_books)	C++20	Compilation error	0 ms	0 KiB

books

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

void solve(int N, int K, long long A, int S){
    int l = 1; r = N;
    int m = (l+r)/2;
    vector<long long>F(N, 0);
    while (l < r){
        m = (l+r)/2;
        long long x = skim(m);
        F[m] = x;
        if (x >= A){
            r = m;
        } else {
            l = m+1;
        }
    }
    if (K > l || l = 1) impossible();
    long long ans = 0;
    for(int i = 0; i < K-1; i++){
        F[i] = skim(i);
        ans += F[i];
    }
    ans += F[l];
    if (ans > 2*A) impossible();
    F[K-1] = skim(K-1);
    ans -= F[l];
    ans += F[K-1];
    int t = 0;
    while (ans < A){
        ans -= F[t];
        F[l-t-1] = skim(l-t-1);
        ans == F[l-t-1];
        t++;
        if (t >= K) break;
    }
    if (ans >= A){
        vector<int>v;
        for(int i = t; i < K; i++)v.push_back(i);
        for(int i = l-1; i > l-t-1; i--)v.push_back(i);
    } else {
        impossible();
    }
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:6:16: error: 'r' was not declared in this scope
    6 |     int l = 1; r = N;
      |                ^
books.cpp:19:15: error: lvalue required as left operand of assignment
   19 |     if (K > l || l = 1) impossible();
      |         ~~~~~~^~~~