# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1085638 | Sunbae | Global Warming (NOI13_gw) | C++17 | 983 ms | 65536 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define z exit(0)
#define mp make_pair
#define F first
#define S second
using namespace std;
using pii = pair<int,int>;
const int N = 1e6 + 5, inf = 1e9;
int cp[N], a[N], m;
set<pii> s;
vector<int> to_remove[N];
int gw(int n, int H[]){
for(int i = m = 0; i<n; ++i) if(H[i]) cp[m++] = H[i];
for(int i = 0; i<m; ++i) to_remove[i].clear(); s.clear();
sort(cp, cp+m); m = unique(cp, cp+m) - cp;
for(int i = 0; i<n; ++i) if(H[i]) to_remove[lower_bound(cp, cp+m, H[i]) - cp].push_back(i);
for(int i = 0, j = 0; i<n; ){
for(; j+1<n && H[j+1] > 0; ++j){}
s.emplace(i, j);
i = j+2; j = i;
}
int mx = (int)s.size();
for(int t = 0; t<m; ++t){
for(int j : to_remove[t]){
auto itr = (--s.upper_bound(mp(j, inf)));
if(itr == s.end()) continue;
int l = itr->F, r = itr->S;
s.erase(itr);
if(l <= j-1) s.emplace(l, j-1);
if(j+1 <= r) s.emplace(j+1, r);
}
mx = max(mx, (int)s.size());
}
return mx;
}
signed main(){
int n; scanf("%d", &n);
int H[n];
for(int i = 0; i<n; ++i) scanf("%d", H+i);
printf("%d", gw(n, H));
}
Compilation message (stderr)
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