Submission #1274498

#	Time	Username	Problem	Language	Result	Execution time	Memory
1274498		phamducluong	Bigger segments (IZhO19_segments)	C++20	100 / 100	57 ms	12100 KiB

segments

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>

//using namespace __gnu_pbds;
using namespace std;
//typedef tree<int,null_type,less_equal<int>,rb_tree_tag, tree_order_statistics_node_update> ordered_set;
#define mem(a,x)       memset(a,x,sizeof(a))
#define int            long long
#define fast(s)        s.reserve(2000); s.max_load_factor(0.5);
#define F              first
#define S              second
#define pii            pair<int,int>
#define iii            tuple<int,int,int>
#define all(p)         p.begin(), p.end()
template<typename T> bool maximum(T &A, const T &B) {return A<B? A=B, true: false;}
template<typename T> bool minimum(T &A, const T &B) {return A>B? A=B, true: false;}
template<typename T> T gcd(T t) {return t;}
template<typename T, typename... Args> T gcd(T t, Args... args) {return __gcd(t,args...);};
void print(bool condition=1) {cout<<(condition? "YES\n": "NO\n");}
const int mod=1e9+7;
const int INF=1e18;
const int N=5e5+5;
int n, a[N];
pii dp[N];
void file()
{
    #define task "main"
    if(fopen(task".inp","r"))
    {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}
void Solve()
{
    cin>>n;
    for(int i=1; i<=n; ++i) cin>>a[i];
    for(int i=1; i<=n; ++i) a[i]+=a[i-1];
    dp[0]={1,0};
    for(int i=1; i<=n; ++i)
    {
        maximum(dp[i],dp[i-1]);
        int j=lower_bound(a+i,a+n+1,2*a[i]-dp[i].S)-a;
        maximum(dp[j],make_pair(dp[i].F+1,a[i]));
    }
    cout<<dp[n].F;
}
signed main()
{
    file();
    Solve();
    cerr<<"Time: "<<1.0*clock()/CLOCKS_PER_SEC;
    return 0;
}

Compilation message (stderr)

segments.cpp: In function 'void file()':
segments.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
segments.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 36 / 36
• Subtask 5: 27 / 27