Submission #1273257

#	Time	Username	Problem	Language	Result	Execution time	Memory
1273257		nlhuy	Stove (JOI18_stove)	C++20	0 / 100	1 ms	568 KiB

stove

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

#define ll long long
#define fi first
#define se second
#define Task "test"

typedef pair<int,int>ii;

const int MOD = 1e9+7;
const int INF = 1e9+7;
const int Maxn = 1e5+7;
const int di[] = {0, 0, -1, 1};
const int dj[] = {-1, 1, 0, 0};

int n,k;
int sum;
int a[Maxn];

bool check(int x){
    int d=k;
    sum=0;
    for(int i=1;i<=n;i++){
        if (d==0) return false;
        int ed=a[i]+x;
        int l=i,r=n,pos=i;
        while(l<=r){
            int g=(l+r)/2;
            if (a[g]+1<=ed) pos=g,l=g+1;
            else r=g-1;
        }
        sum+=a[pos]+1-a[i];
        i=pos;
        d--;
    }
    return true;
}
void run_case(){
    cin>>n>>k;
    for(int i=1;i<=n;i++) cin>>a[i];
    int l=1,r=a[n],ans;
    while(l<=r){
        int g=(l+r)/2;
        if (check(g)) ans=sum,r=g-1;
        else l=g+1;
    }
    cout<<ans;
}
int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    if (fopen(Task ".inp", "r"))
    {
        freopen(Task ".inp", "r", stdin);
        freopen(Task ".out", "w", stdout);
    }
    int t = 1;
    //cin >> t;
    while(t--){
        run_case();
    }
}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:54:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |         freopen(Task ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen(Task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50