Submission #245738

#	Time	Username	Problem	Language	Result	Execution time	Memory
245738		Mercenary	Bigger segments (IZhO19_segments)	C++14	100 / 100	114 ms	13048 KiB

segments

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

#define pb push_back
#define mp make_pair
#define taskname "A"

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
typedef tree <pair<ll,int>,null_type,less<pair<ll,int>>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

const int maxn = 5e5 + 5;
const int mod = 1e9 + 7;
int n;
ll s[maxn];
int dp[maxn];
int t[maxn];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
		freopen(taskname".INP", "r",stdin);
		freopen(taskname".OUT", "w",stdout);
    }
    cin >> n;
    for(int i = 1 ; i <= n ; ++i){
        cin >> s[i];
        s[i] += s[i - 1];
    }
    for(int i = 1 ; i <= n ; ++i){
        t[i] = max(t[i] , t[i - 1]);
        dp[i] = dp[t[i]] + 1;
        int it = lower_bound(s + 1 , s + n + 1 , s[i] + s[i] - s[t[i]]) - s;
        t[it] = max(t[it] , i);
    }
    cout << dp[n];
}

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:29:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".INP", "r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:30:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".OUT", "w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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