Submission #170352

#	Time	Username	Problem	Language	Result	Execution time	Memory
170352		ngmh	Global Warming (NOI13_gw)	C++11	40 / 40	839 ms	31292 KiB

gw

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

int n, a[1000000], h = 0, c = -1, t = 0, l = 0;
vector<pair<int, int> > pv, is;
int main(){
    cin >> n;
    for(int i = 0; i < n; i++) cin >> a[i];
    if(n > 1){
        if(a[0] > a[1]) pv.push_back(make_pair(a[0], 1));
        if(a[n-1] > a[n-2]) pv.push_back(make_pair(a[n-1], 1));
    }
    for(int i = 1; i < n-1; i++){
        if(a[i-1] > a[i]){
           while(a[i] == a[i+1]) i++;
           if(a[i] < a[i+1]) pv.push_back(make_pair(a[i], -1));
        } else if(a[i-1] < a[i]){
           while(a[i] == a[i+1]) i++;
           if(a[i] > a[i+1]) pv.push_back(make_pair(a[i], 1));
        }
    }
    sort(pv.begin(), pv.end());
    reverse(pv.begin(), pv.end());
    for(int i = 0; i < pv.size(); i++){
        if(pv[i].first == c) t += pv[i].second;
        else {
            if(c != -1) is.push_back(make_pair(c, t));
            c = pv[i].first;
            t = pv[i].second;
        }
    }
    for(int i = 0; i < is.size(); i++){
        l += is[i].second;
        h = max(h, l);
    }
    cout << h;
}

Compilation message (stderr)

gw.cpp: In function 'int main()':
gw.cpp:24:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < pv.size(); i++){
                    ~~^~~~~~~~~~~
gw.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < is.size(); i++){
                    ~~^~~~~~~~~~~

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