Submission #426476

#	Time	Username	Problem	Language	Result	Execution time	Memory
426476		juggernaut	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	43 ms	8484 KiB

Main

#include<bits/stdc++.h>
#define fr first
#define sc second
using namespace std;
void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
typedef long long ll;
#define USING_ORDERED_SET 0
#if USING_ORDERED_SET
#include<bits/extc++.h>
using namespace __gnu_pbds;
template<class T>using ordered_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
#endif
template<class T>void umax(T &a,T b){if(a<b)a=b;}
template<class T>void umin(T &a,T b){if(b<a)a=b;}
#ifdef IOI2021SG
    #define printl(args...)printf(args)
#else
    #define printl(args...)((void)0)
#endif
int n;
ll a[200005];
ll b[200005];
ll pref[200005];
ll suff[200005];
int main(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++)scanf("%lld",&a[i]),b[i]=a[i];
    for(int i=2;i<=n;i++){
        b[i]+=suff[i-1];
        ll pivot=max(0ll,b[i-1]-b[i]+1);
        suff[i]=suff[i-1]+pivot;
        b[i]+=pivot;
    }
    for(int i=1;i<=n;i++)b[i]=a[n-i+1];
    for(int i=2;i<=n;i++){
        b[i]+=pref[i-1];
        ll pivot=max(0ll,b[i-1]-b[i]+1);
        pref[i]=pref[i-1]+pivot;
        b[i]+=pivot;
    }
    reverse(pref+1,pref+1+n);
    ll mn=9e18;
    for(int i=1;i<=n;i++)umin(mn,max(pref[i],suff[i]));
    printf("%lld",mn);
}

Compilation message (stderr)

Main.cpp: In function 'void usaco(std::string)':
Main.cpp:5:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:5:66: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:26:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
Main.cpp:27:31: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     for(int i=1;i<=n;i++)scanf("%lld",&a[i]),b[i]=a[i];
      |                          ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 40 / 40
• Subtask 2: 60 / 60