Submission #40997

#	Time	Username	Problem	Language	Result	Execution time	Memory
40997		yusufake	Taxis (POI13_tak)	C++98	100 / 100	175 ms	4580 KiB

tak

#include<bits/stdc++.h>

using namespace std;

#define _   int v, int tl, int tr, int l, int r, int h
#define tm  (tl+tr >> 1)
#define sol v+v,tl,tm,l,r,h
#define sag v+v+1,tm+1,tr,l,r,h

#define mp make_pair
#define pb push_back
#define st first
#define nd second

typedef long long ll;
typedef pair < int , int > pp;

const int mod = 1e9 + 7;
const int N   = 5e5 + 5;

ll A[N],m,d,n,i,j,x;

void fail() { cout << 0; exit(0); }

int main(){
	cin >> m >> d >> n;
	for(i=1;i<=n;i++) scanf("%lld", &A[i]);
	sort(A+1 , A+n+1);
	reverse(A+1 , A+n+1);
    if(A[1] < m-d) fail();
	for(i=1;i<=n && A[i] >= m-d;i++){
        if(A[i] < d-x) fail();
		x += A[i] - max(0LL , d - x);
		if(x >= m) { cout << i; return 0; }	
    }
    
    i--;
	x = 0;
    for(j=1;j<i;j++){
		x += A[j] - max(0LL , d - x);
	}
	for(j=i+1;j<=n;j++){
		if(A[j] < d-x) fail();
        x += A[j] - max(0LL , d - x);
        if(x+A[i]-max(0LL,d-x) >= m) { cout << j; return 0; }
	}
	
	cout << 0;	
	return 0;
}

Compilation message (stderr)

tak.cpp: In function 'int main()':
tak.cpp:27:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(i=1;i<=n;i++) scanf("%lld", &A[i]);
                                        ^

• 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