Submission #40952

#	Time	Username	Problem	Language	Result	Execution time	Memory
40952		wzy	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	604 ms	21464 KiB

bobek

#include <stdio.h>
#include <vector>
#include <stdint.h>
#include <algorithm>
using namespace std;
#define pb push_back
#define int long long
int ans = 1 , v1[50] , v2[50] , n , m;


int32_t main(){
	scanf("%lld%lld" , &n , &m);
	int sz1 = n / 2 , sz2 =  n - sz1;
	for(int i = 0 ; i < n;i++){
		if(sz1){
			scanf("%lld" , &v1[n/2 - sz1]);
			sz1--;
		}
		else{
			scanf("%lld" , &v2[(n - n/2) - sz2]);
			sz2--;
		}
	}
	vector<int> value1 , value2;
	sz1 = n/2 , sz2 = n - sz1;
	for(int i = 1 ; i < (1<<sz1) ; i++){
		int sum = 0;
		for(int j = 0 ; j < n ; j++){
			if(1<<j & i) sum += v1[j];
		}
		if(sum <= m)
		value1.pb(sum);
	}
	for(int i = 1 ; i < (1<<sz2) ; i++){
		int sum = 0;
		for(int j = 0 ; j < n ; j++){
			if(1<<j & i) sum += v2[j];
		}
		if(sum <= m)
		value2.pb(sum);
	}
	ans += value1.size() + value2.size();
	sort(value1.begin() , value1.end());
	sort(value2.begin() , value2.end());
	for(int i = 0 ; i < value1.size() ; i++){
		int l = 0 , r = (int)value2.size() - 1;
		int ansj = -1;
		while(l<= r){
			int mid = (l+r)/2;
			if(value2[mid] + value1[i] <= m){
				l = mid + 1;
				ansj = max(ansj , mid);
			}
			else r = mid - 1;
		}
		if(ansj != -1) ans += ansj + 1;
	}
	printf("%lld\n" , ans);
}

Compilation message (stderr)

bobek.cpp: In function 'int32_t main()':
bobek.cpp:45:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0 ; i < value1.size() ; i++){
                    ^
bobek.cpp:12:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld" , &n , &m);
                             ^
bobek.cpp:16:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%lld" , &v1[n/2 - sz1]);
                                  ^
bobek.cpp:20:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%lld" , &v2[(n - n/2) - sz2]);
                                        ^

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10