Submission #1061144

#	Time	Username	Problem	Language	Result	Execution time	Memory
1061144		Kerim	Sequence (APIO23_sequence)	C++17	12 / 100	51 ms	16460 KiB

sequence

#include "sequence.h"

#include <vector>
#include "bits/stdc++.h"
using namespace std;
int sequence(int N, std::vector<int> arr) {
    int cnt = 0;
    vector<int> one{0}, two{0};
    vector<int> A(N+1), B(N+1);
    for (int i = 0; i < N; i++){
        int x = arr[i];
        assert(1 <= x and x <= 3);
        A[i+1] = A[i]-1;
        B[i+1] = B[i]-1;
        if (x == 1)
            A[i+1] += 2, one.push_back(i+1);
        else if (x == 3)
            B[i+1] += 2, two.push_back(i+1);
        else
            cnt += 1;
    }
    int st = 1, en = N;
    while (st < en){
        int mid = (st+en+1) >> 1;
        bool ok = 0;
        for (int i = mid; i < one.size(); i++)
            ok |= (A[one[i]] >= A[one[i-mid]]);
        for (int i = mid; i < two.size(); i++)
            ok |= (B[two[i]] >= B[two[i-mid]]);
        if (ok)
            st = mid;
        else
            en = mid-1;
    }
    return max(cnt, st);
}

Compilation message (stderr)

sequence.cpp: In function 'int sequence(int, std::vector<int>)':
sequence.cpp:26:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |         for (int i = mid; i < one.size(); i++)
      |                           ~~^~~~~~~~~~~~
sequence.cpp:28:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |         for (int i = mid; i < two.size(); i++)
      |                           ~~^~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 17
• Subtask 3: 0 / 7
• Subtask 4: 12 / 12
• Subtask 5: 0 / 13
• Subtask 6: 0 / 22
• Subtask 7: 0 / 18