Submission #152619

#	Time	Username	Problem	Language	Result	Execution time	Memory
152619		Mercenary	Sure Bet (CEOI17_sure)	C++14	100 / 100	122 ms	5240 KiB

sure

#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 <int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

const int maxn = 1e5 + 5;
int n;
ld a[maxn] , b[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 >> a[i] >> b[i];
    }
    sort(a + 1 , a + n + 1);
    sort(b + 1 , b + n + 1);
    int j = n;
    ld suml = 0 , sumr = 0;
    ld res = 0;
    for(int i = n ; i >= 0 ; --i){
        res = max(res , min(suml, sumr) - 2 * n + i + j);
//        cout << suml << " " << sumr << endl;
        while(j >= 1 && suml > sumr){
            sumr += b[j--];
            res = max(res , min(suml, sumr) - 2 * n + i + j);
        }
//        cout << suml << " " << sumr << endl;
        suml += a[i];
        res = max(res , min(suml, sumr) - 2 * n + i + j - 1);
    }
    cout << fixed << setprecision(4) << res;
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:26:10: 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);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
sure.cpp:27:10: 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: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40