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 FILE
#define fr first
#define se second
using namespace std;
const long long N = 1e5 + 7;
const long long inf = 1e9 + 7;
const long long mod = 1e9 + 7;
int n;
int k;
int a[N];
set<pair<int, int>> s;
vector<pair<int, pair<int, int>>> b;
int main()
{
ios_base::sync_with_stdio(false);
cin >> n >> k;
for(int i = 1; i <= n; i ++){
cin >> a[i];
s.insert({i, i});
}
if(n == 1){
cout << "1\n";
return 0;
}
for(int i = 2; i <= n; i ++){
b.push_back({a[i] - a[i - 1] + 1, {i - 1, i}});
}
sort(b.begin(), b.end());
while(s.size() > k && !b.empty()){
int l = b.begin()->second.first;
int r = b.begin()->second.second;
b.erase(b.begin());
auto y = s.lower_bound({r, r});
auto x = y;
x --;
if(x == s.end() || y == s.end()){
continue;
}
s.erase(x);
s.erase(y);
s.insert({x->first, y->second});
}
long long res = 0;
for(auto x: s){
res += (a[x.second] - a[x.first] + 1);
}
cout << res << "\n";
}
Compilation message (stderr)
stove.cpp: In function 'int main()':
stove.cpp:35:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(s.size() > k && !b.empty()){
~~~~~~~~~^~~
stove.cpp:36:13: warning: unused variable 'l' [-Wunused-variable]
int l = b.begin()->second.first;
^
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