Submission #336325

#	Time	Username	Problem	Language	Result	Execution time	Memory
336325		beepbeepsheep	Global Warming (NOI13_gw)	C++17	19 / 40	214 ms	34132 KiB

gw

#include <bits/stdc++.h>

using namespace std;
#define ll long long

const ll bignum=1e17;
const int inf= 2e9;
const int mod= 1e9+7;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    ll ele,n;
    cin>>n;
    vector<ll> arr;
    ll prev=-1;
    for (int i=0;i<n;i++){
        cin>>ele;
        if (ele!=prev){
            arr.push_back(ele);
        }
        prev=ele;
    }
    if (arr.size()==1){
        cout<<1;
        return 0;
    }
    vector<pair<ll,ll>> v;
    for (int i=1;i<arr.size()-1;i++){
        if (arr[i]>arr[i-1] && arr[i]>arr[i+1]){
            v.push_back(make_pair(arr[i],1));
        }
        if (arr[i]<arr[i-1] && arr[i]<arr[i+1]){
            v.push_back(make_pair(arr[i],-1));
        }
    }
    if (arr[0]>arr[1]) v.push_back(make_pair(arr[0],1));
    if (arr[arr.size()-1]>arr[arr.size()-2]) v.push_back(make_pair(arr[arr.size()-1],1));
    sort(v.rbegin(),v.rend());
    ll ans=0,curr=0;
    for (int i=0;i<v.size();i++){
        curr+=v[i].second;
        if (i!=v.size()-1 && v[i+1].first==v[i].first) continue;
        ans=max(curr,ans);
    }
    cout<<ans;
    return 0;
}

Compilation message (stderr)

gw.cpp: In function 'int main()':
gw.cpp:31:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for (int i=1;i<arr.size()-1;i++){
      |                  ~^~~~~~~~~~~~~
gw.cpp:43:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for (int i=0;i<v.size();i++){
      |                  ~^~~~~~~~~
gw.cpp:45:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         if (i!=v.size()-1 && v[i+1].first==v[i].first) continue;
      |             ~^~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 7 / 7
• Subtask 4: 0 / 10
• Subtask 5: 0 / 11