Submission #774621

#	Time	Username	Problem	Language	Result	Execution time	Memory
774621		vgoofficial	Global Warming (CEOI18_glo)	C++14	22 / 100	41 ms	6200 KiB

glo

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
vector<int> magic2;
int main() {
    ios_base::sync_with_stdio(false); 
    cin.tie(0);
    int n,x;
    cin >> n >> x;
    int temps[n];
    for(int i = 0; i < n; i++) cin >> temps[i];
    int longestIncreasing[n+1], largestNumber[n+1], longestIncreasing2[n+1];
    vector<int> magic;
    longestIncreasing[0]=0;
    largestNumber[0]=1<<31;
    longestIncreasing2[n]=0;
    magic.push_back(temps[0]);
    longestIncreasing[1]=1;
    largestNumber[1]=-(temps[0]-x);
    for(int i = 1; i < n; i++) {
        int lb = lower_bound(begin(magic), end(magic), temps[i])-begin(magic);
        if(lb==magic.size()) {
            magic.push_back(temps[i]);
        } else {
            magic[lb]=temps[i];
        }
        longestIncreasing[i+1]=magic.size();
        largestNumber[i+1]=-(magic.back()-x);
    }
    for(int i = 0; i < n; i++) {
        temps[i]*=-1;
    }
    vector<int> magic2;
    magic2.push_back(temps[n-1]);
    if(temps[n-1]<largestNumber[n-1]) {
        longestIncreasing2[n-1]=1;
    } else {
        longestIncreasing2[n-1]=0;
    }
    for(int i = n-2; i >= 0; i--) {
        int lb = lower_bound(begin(magic2), end(magic2), temps[i])-begin(magic2);
        if(lb==magic2.size()) {
            magic2.push_back(temps[i]);
        } else {
            magic2[lb]=temps[i];
        }
        int lbb = lower_bound(begin(magic2), end(magic2), largestNumber[i])-begin(magic2);
        if(lbb==magic2.size()) {
            longestIncreasing2[i]=magic2.size();
        } else if(magic2[lbb]==largestNumber[i]) {
            longestIncreasing2[i]=lbb;
        } else {
            longestIncreasing2[i]=lbb+1;
        }
    }
    int max = 0;
    for(int i = 0; i <= n; i++) {
        max=std::max(max, longestIncreasing[i]+longestIncreasing2[i]);
    }
    cout << max << endl;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:22:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         if(lb==magic.size()) {
      |            ~~^~~~~~~~~~~~~~
glo.cpp:42:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |         if(lb==magic2.size()) {
      |            ~~^~~~~~~~~~~~~~~
glo.cpp:48:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |         if(lbb==magic2.size()) {
      |            ~~~^~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 17 / 17
• Subtask 7: 0 / 25