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# Author Problem Lang Verdict Time Memory Sent Judged  
112062025 Practice:
macci
1110B - 21 C++14 (GCC 6-32) Wrong answer on test 7 77 ms 164 KB 2021-04-05 12:25:27 2021-04-05 12:25:27
→ Source
#include<bits/stdc++.h>


using namespace std;

int check(int len,vector<int> &v){
    int ans = 1;
    int prev = v[0];
    for(int i=1;i<v.size();i++){
        if(v[i] - prev + 1> len){
            ans++;
            prev = v[i];
        }
    }
    return ans;
}

int main(){
    int n,m,k;
    cin>>n>>m>>k;
    vector<int> v(n);
    
    for(int i=0;i<n;i++){
        cin>>v[i];
    }
    
    int s = 1;
    int e = m;
    int ans = -1;
    while(s <= e){
        int mid = s + (e - s)/2;
        if(check(mid,v) <= k){
            ans = mid;
            e = mid - 1;
        }
        else{
            s = mid + 1;
        }
    }
    int len = ans;
    int prev = v[0];
    long long res = 0ll;
    for(int i=0;i<n;i++){
        if(v[i] - prev + 1 > ans){
            res += (long long)v[i-1] - prev + 1;
            prev = v[i];
        }
        if(i==n-1){
            res+=(long long)v[i] - prev + 1;
        }
    }
    
    cout<<res<<endl;
    return 0;
}
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