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Submission #313336

# Submission time Handle Problem Language Result Execution time Memory
313336 2020-10-15T19:35:59 Z mohamedsobhi777 Sure Bet (CEOI17_sure) C++14
60 / 100
 2000 ms 2204 KB 
#include<bits/stdc++.h>


#pragma GCC optimize("-Ofast")
//#pragma GCC optimize("trapv")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,sse4.2,popcnt,abm,mmx,avx2,tune=native")
#pragma GCC optimize("-ffast-math")
#pragma GCC optimize("-funroll-loops")

#define I inline void 
#define S struct 
#define vi vector<int> 
#define vii vector<pair<int,int>>
#define pii pair<int,int>
#define pll pair<ll,ll>

using namespace std ; 
using ll = long long ; 
using ld = long double ; 

const int N = 2e5 + 7 , mod = 1e9 + 7 ; 
const ll inf = 2e18 ; 

// How interesting!

int n ; 
vector<double> d[2] ; 
double ans ; 

void solve(){
        double pref = 0.0 ; 
        for(int i = 0 ; i < n; ++ i){
                pref += d[0][i] ; 
                double sum = -(i+1) ; 
                for(int j = 0 ;j < n ; ++ j){
                        sum += d[1][j]; 
                        if(sum < pref)continue ; 
                        ans = max(ans , pref - double(j + 1) ) ; 
                }
        }
}

void solve2(){
        double sum1 = 0 ; 
        for(int i = 0 ;i < n; ++ i){
                sum1 += d[0][i] ; 
                double sum2 = -(i+1) ; 
                for(int j = 0 ;j < n ; ++ j){
                        sum2 += d[1][j] ; 
                        ans = max(ans , min( sum1 - (j + 1) , sum2 ) ) ; 
                }
        }
}

int main(){
        ios_base::sync_with_stdio(0) ;
        cin.tie(0) ; 
        //freopen("in.in" , "r" , stdin) ; 
        cin >> n; 
        for(int i = 0 ;i < n; ++ i){
                double a , b; 
                cin >> a >> b ;
                a-=1.0 ; b-=1.0 ; 
                d[0].push_back(a) ; 
                d[1].push_back(b) ; 
        }
        for(int i = 0 ;i < 2 ; ++ i)
                sort(d[i].begin() , d[i].end(), greater<double>()) ; 

        solve2() ; 
        swap(d[0] , d[1]) ; 
        solve2() ; 
        cout<< fixed <<setprecision(4) << ans ;
        return 0 ; 
}

/*
        - bounds sir (segtree = 4N, eulerTour = 2N, ...)
        - a variable defined twice?
        - will overflow?
        - is it a good complexity?
        - don't mess up indices (0-indexed vs 1-indexed)
        - reset everything between testcases. 
*/

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 17 ms 384 KB Output is correct
13 Correct 17 ms 384 KB Output is correct
14 Correct 17 ms 384 KB Output is correct
15 Correct 17 ms 384 KB Output is correct
16 Correct 17 ms 384 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 17 ms 384 KB Output is correct
13 Correct 17 ms 384 KB Output is correct
14 Correct 17 ms 384 KB Output is correct
15 Correct 17 ms 384 KB Output is correct
16 Correct 17 ms 384 KB Output is correct
17 Execution timed out 2071 ms 2204 KB Time limit exceeded
18 Halted 0 ms 0 KB -