Submission #586609

#	Time	Username	Problem	Language	Result	Execution time	Memory
586609		aris12345678	Global Warming (CEOI18_glo)	C++14	100 / 100	48 ms	4424 KiB

glo

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

int main() {
    int N, X;
    scanf("%d %d", &N, &X);
    vector<int> A(N);
    for(int i = 0; i < N; i++)
        scanf("%d", &A[i]);
    vector<int> LIS;
    vector<int> INC(N, 0);
    LIS.push_back(A[0]);
    INC[0] = 1;
    for(int i = 1; i < N; i++) {
        int pos = lower_bound(LIS.begin(), LIS.end(), A[i])-LIS.begin();
        INC[i] = pos+1;
        if(pos < LIS.size())
            LIS[pos] = A[i];
        else
            LIS.push_back(A[i]);
    }
    LIS.clear();
    LIS.push_back(-A[N-1]);
    int ans = 0;
    for(int i = N-2; i >= 0; i--) {
        int len = lower_bound(LIS.begin(), LIS.end(), -A[i]+X)-LIS.begin();
        ans = max(ans, INC[i]+len);
        int pos = lower_bound(LIS.begin(), LIS.end(), -A[i])-LIS.begin();
        if(pos < LIS.size())
            LIS[pos] = -A[i];
        else
            LIS.push_back(-A[i]);
    }
    printf("%d\n", ans);
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:17:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |         if(pos < LIS.size())
      |            ~~~~^~~~~~~~~~~~
glo.cpp:29:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         if(pos < LIS.size())
      |            ~~~~^~~~~~~~~~~~
glo.cpp:6:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 |     scanf("%d %d", &N, &X);
      |     ~~~~~^~~~~~~~~~~~~~~~~
glo.cpp:9:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |         scanf("%d", &A[i]);
      |         ~~~~~^~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25