oj.uz

Submission #671672

# Submission time Handle Problem Language Result Execution time Memory
671672 2022-12-13T12:56:59 Z ReLice Divide and conquer (IZhO14_divide) C++17
100 / 100
 66 ms 51148 KB 
#include<bits/stdc++.h>
using namespace std;
#define endl "\n"
#define ll long long
#define ld long double
#define int long long
#define pb push_back
#define sz size()
#define fr first
#define sc second
//#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
void fre(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
void start(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}
const int N=1e6+5;
const int mod=1e9+7;
const int inf=1e7;
vector <ll> x(N),g(N),a(N),pref(N),pref2(N);
map<ll,vector<ll>> mp ;
void solve(){
    ll n,i,mx=-1,l,r,k;
    cin>>n;
	ll suf[n];
	for(i=0;i<n;i++) cin>>x[i]>>g[i]>>a[i];
	pref[0]=a[0];
	pref2[0]=g[0];
	for (i=1;i<n;i++){
		pref[i]=pref[i-1];
		pref[i]+=a[i];
		pref2[i]=pref2[i-1]+g[i];
		mp[pref[i]].pb(i);
	}
	suf[n-1]=pref[n-1]-x[n-1];
	for(ll i=n-2;i>=0;i--) suf[i] = max(suf[i + 1], pref[i] - x[i]);
	for(ll i=0;i<n;i++){
        k=-x[i];
		if(i>0)k+=pref[i-1];
		l=i;
        r=n;
		while(l+1<r){
			ll mid=(l+r)>>1;
			if(suf[mid]>=k) l=mid;
			else r=mid;
		}
		mx=max(mx,pref2[l]-pref2[i]+g[i]);
	}
	cout<<mx<<endl;
}
signed main(){
    //fre("divide");
    start();
    ll t=1;
    //cin>>t;
    while(t--) solve();
}

Compilation message

divide.cpp: In function 'void fre(std::string)':
divide.cpp:12:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 | void fre(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
divide.cpp:12:64: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 | void fre(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                                                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 39380 KB Output is correct
2 Correct 14 ms 39464 KB Output is correct
3 Correct 15 ms 39380 KB Output is correct
4 Correct 14 ms 39380 KB Output is correct
5 Correct 14 ms 39364 KB Output is correct
6 Correct 15 ms 39380 KB Output is correct
7 Correct 15 ms 39440 KB Output is correct
8 Correct 15 ms 39432 KB Output is correct
9 Correct 16 ms 39380 KB Output is correct
10 Correct 16 ms 39380 KB Output is correct
11 Correct 14 ms 39380 KB Output is correct
12 Correct 14 ms 39452 KB Output is correct

Subtask #2
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 39380 KB Output is correct
2 Correct 14 ms 39464 KB Output is correct
3 Correct 15 ms 39380 KB Output is correct
4 Correct 14 ms 39380 KB Output is correct
5 Correct 14 ms 39364 KB Output is correct
6 Correct 15 ms 39380 KB Output is correct
7 Correct 15 ms 39440 KB Output is correct
8 Correct 15 ms 39432 KB Output is correct
9 Correct 16 ms 39380 KB Output is correct
10 Correct 16 ms 39380 KB Output is correct
11 Correct 14 ms 39380 KB Output is correct
12 Correct 14 ms 39452 KB Output is correct
13 Correct 14 ms 39424 KB Output is correct
14 Correct 14 ms 39380 KB Output is correct
15 Correct 14 ms 39500 KB Output is correct
16 Correct 18 ms 39500 KB Output is correct
17 Correct 15 ms 39520 KB Output is correct
18 Correct 15 ms 39728 KB Output is correct
19 Correct 16 ms 39508 KB Output is correct
20 Correct 15 ms 39508 KB Output is correct
21 Correct 15 ms 39604 KB Output is correct
22 Correct 16 ms 39684 KB Output is correct
23 Correct 17 ms 40044 KB Output is correct
24 Correct 18 ms 40132 KB Output is correct

Subtask #3
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 39380 KB Output is correct
2 Correct 14 ms 39464 KB Output is correct
3 Correct 15 ms 39380 KB Output is correct
4 Correct 14 ms 39380 KB Output is correct
5 Correct 14 ms 39364 KB Output is correct
6 Correct 15 ms 39380 KB Output is correct
7 Correct 15 ms 39440 KB Output is correct
8 Correct 15 ms 39432 KB Output is correct
9 Correct 16 ms 39380 KB Output is correct
10 Correct 16 ms 39380 KB Output is correct
11 Correct 14 ms 39380 KB Output is correct
12 Correct 14 ms 39452 KB Output is correct
13 Correct 14 ms 39424 KB Output is correct
14 Correct 14 ms 39380 KB Output is correct
15 Correct 14 ms 39500 KB Output is correct
16 Correct 18 ms 39500 KB Output is correct
17 Correct 15 ms 39520 KB Output is correct
18 Correct 15 ms 39728 KB Output is correct
19 Correct 16 ms 39508 KB Output is correct
20 Correct 15 ms 39508 KB Output is correct
21 Correct 15 ms 39604 KB Output is correct
22 Correct 16 ms 39684 KB Output is correct
23 Correct 17 ms 40044 KB Output is correct
24 Correct 18 ms 40132 KB Output is correct
25 Correct 18 ms 40020 KB Output is correct
26 Correct 21 ms 40652 KB Output is correct
27 Correct 19 ms 40660 KB Output is correct
28 Correct 38 ms 45364 KB Output is correct
29 Correct 40 ms 45260 KB Output is correct
30 Correct 66 ms 51140 KB Output is correct
31 Correct 60 ms 51140 KB Output is correct
32 Correct 62 ms 51148 KB Output is correct
33 Correct 65 ms 51144 KB Output is correct
34 Correct 65 ms 51148 KB Output is correct
35 Correct 63 ms 51124 KB Output is correct
36 Correct 65 ms 51124 KB Output is correct