La 4725 (Binary) Airport

Question:

There are two runways, W and E. Each runway is numbered from 0 at each time, and each time there are WI and EI planes arriving at these two runways. In addition, only one plane on the runway can take off at each time. Ask how to minimize the maximum number of aircraft. (The number is calculated at each time point before the plane departs)

Ideas:

It is also the smallest problem of the maximum value. Binary can be used, but I didn't think of binary.

Reference to someone else's code: http://blog.csdn.net/u011345136/article/details/17793415

The departure decision is as follows:

If one runway is empty and the other runway has an airplane, it must be the runway with an airplane.

If both runways have planes, add one record of the number of departures.

Assume that the maximum number is K. If the two runways come out more than K, the maximum number is larger than K.

 

1 // # define local 2 # include <iostream> 3 # include <cstdio> 4 # include <cstring> 5 using namespace STD; 6 7 const int maxn = 5000 + 10; 8 const int INF = 150000; 9 int A [maxn], B [maxn], n; 10 11 bool check (int K) 12 {13 int A = 0, B = 0, AA, BB, sum = 0; // a B is the number of planes on two runways respectively. 14 for (INT I = 0; I <n; ++ I) 15 {16 A + = A [I]; 17 B + = B [I]; 18 AA = max (a-k, 0 ); 19 BB = max (B-K, 0); 20 if (AA + BB> sum) return false; 21 if (a = 0 & B) -- B; 22 else if (B = 0 & A) -- A; 23 else if (A & B & A + B> sum) ++ sum; // a + B <= sum indicates that neither runway has a plane 24} 25 return true; 26} 27 28 int main (void) 29 {30 # ifdef local31 freopen ("4725in.txt", "r", stdin); 32 # endif33 34 int t; 35 scanf ("% d", & T ); 36 while (t --) 37 {38 scanf ("% d", & N); 39 for (INT I = 0; I <n; ++ I) 40 scanf ("% d", & A [I], & B [I]); 41 42 int L = 0, r = inf; 43 44 int ans; 45 while (L <= r) 46 {47 int mid = (L + r)> 1; 48 if (check (MID) 49 {50 ans = mid; 51 r = mid-1; 52} 53 else l = Mid + 1; 54} 55 printf ("% d \ n", ans-1); 56 57} 58 59 return 0; 60}

Code Jun

 

La 4725 (Binary) Airport