Submission #855469

#	Time	Username	Problem	Language	Result	Execution time	Memory
855469		devesh_7	Bigger segments (IZhO19_segments)	C++14	0 / 100	1 ms	500 KiB

segments

#include<bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// Including tree_order_statistics_node_update
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
  
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>

using namespace std;

#define fastio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define MOD 1000000007
#define MOD1 998244353
#define INF 1e18
#define nline "\n"
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define ff first
#define ss second
#define PI 3.141592653589793238462
#define set_bits __builtin_popcountll
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()

typedef long long ll;
typedef unsigned long long ull;
typedef long double lld;
// typedef tree<pair<int, int>, null_type, less<pair<int, int>>, rb_tree_tag, tree_order_statistics_node_update > pbds; // find_by_order, order_of_key

#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x <<" "; _print(x); cerr << endl;
#else
#define debug(x)
#endif

void _print(ll t) {cerr << t;}
void _print(int t) {cerr << t;}
void _print(string t) {cerr << t;}
void _print(char t) {cerr << t;}
void _print(lld t) {cerr << t;}
void _print(double t) {cerr << t;}
void _print(ull t) {cerr << t;}

template <class T, class V> void _print(pair <T, V> p);
template <class T> void _print(vector <T> v);
template <class T> void _print(set <T> v);
template <class T, class V> void _print(map <T, V> v);
template <class T> void _print(multiset <T> v);
template <class T, class V> void _print(pair <T, V> p) {cerr << "{"; _print(p.ff); cerr << ","; _print(p.ss); cerr << "}";}
template <class T> void _print(vector <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T> void _print(set <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T> void _print(multiset <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void _print(map <T, V> v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";}
ll mod=1e9+7;
ll power(ll a,ll b){
    ll temp=a;
    ll num=1;
    while(b>0){
        if(b%2==1){
            num*=temp;
            num%=mod;
        }
        temp*=temp;
        temp%=mod;
        b/=2;
    }
    return num;
}
ll modulo_inv(ll a){
    return power(a,mod-2);
}
ll ncr(ll n,ll r,ll fact[],ll inv_fact[]){
    if(n<r){
        return 0;
    }
    return (((fact[n]*inv_fact[r])%mod)*inv_fact[n-r])%mod;

}
ll gcd(ll a,ll b){
    if(b==0){
        return a;
    }
    return gcd(b,a%b);
}
bool isPowerOfTwo(ll x)
{
    if(x<0) return false;
    /* First x in the below expression is for the case when
     * x is 0 */
    return x && (!(x & (x - 1)));
}
int main() {
#ifndef ONLINE_JUDGE
    freopen("Error.txt", "w", stderr);
#endif
    fastio();
    ll n;
    cin>>n;
    ll a[n+1];
    a[0]=0;
    for(int i=1;i<=n;i++){
        cin>>a[i];
        a[i]+=a[i-1];
    }
    set<pair<ll,ll>>st;
    st.insert({0,0});
    vector<pair<ll,ll>>dp(n+1,{1e15,1});
    dp[0]={0,0};
    for(int i=1;i<=n;i++){
        auto itr=st.upper_bound({a[i],LLONG_MAX});
        itr--;
        dp[i].first=a[i]-a[itr->second];
        dp[i].second=dp[itr->second].second+1;
        st.insert({a[i]+dp[i].first,i});
    }
    cout<<dp[n].second;

    
    

    return 0;

}

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:95:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |     freopen("Error.txt", "w", stderr);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27