工艺品__

// Problem: 工艺品
// Contest: NowCoder
// URL: https://ac.nowcoder.com/acm/contest/11227/E
// Memory Limit: 524288 MB
// Time Limit: 2000 ms
// 2022-05-21 20:41:09
// 
// Powered by CP Editor (https://cpeditor.org)

#include<bits/stdc++.h>
using namespace std;

#define rep(i,l,r) for(int i=(l);i<=(r);i++)
#define per(i,l,r) for(int i=(l);i>=(r);i--)
#define ll long long
#define mset(s,t) memset(s,t,sizeof(t))
#define mcpy(s,t) memcpy(s,t,sizeof(t))
#define fi first
#define se second
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define SZ(x) ((int)(x).size())
#define mp make_pair

typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;   
typedef vector<ll> Vll;               
typedef vector<pair<int, int> > vpii;
typedef vector<pair<ll, ll> > vpll;                        

const ll mod = 1e9 + 7;
//const ll mod = 998244353;
const double pi  = acos(-1.0);
inline ll ksc(ll x,ll y,ll mod)
{
    ll ans = 0;
    while (y) {
    	if (y & 1)
    		ans = (ans + x) %mod;
    	y >>= 1;
    	x = (x + x) %mod;
	}
	return ans;
}
inline ll qmi (ll a, ll b) {
	ll ans = 1;
	while (b) {
		if (b & 1) ans = ans * a;
		a = a * a;
		b >>= 1;
	}
	return ans;
}
inline int read () {
	int x = 0, f = 0;
	char ch = getchar();
	while (!isdigit(ch)) f |= (ch=='-'),ch= getchar();
	while (isdigit(ch)) x = x * 10 + ch - '0', ch = getchar();
	return f?-x:x;
}
template<typename T> void print(T x) {
	if (x < 0) putchar('-'), x = -x;
	if (x >= 10) print(x/10);
	putchar(x % 10 + '0');
}
inline ll sub (ll a, ll b) {
	return ((a - b ) %mod + mod) %mod;
}
inline ll add (ll a, ll b) {
	return (a + b) %mod;
}
// inline ll inv (ll a) {
	// return qmi(a, mod - 2);
// }
ll n, a, b, c;
void solve() {
	
	 
}
int main () {
	 ios::sync_with_stdio(0),cin.tie(0), cout.tie(0);
    cin >> n >> a >> b >> c;
	if (c >= a) {
		cout << n / a << endl;
	}
	else if (c < a&& b <= c) {
        ll t = (n - b) / c;
		cout << (n - b) / c + (n - t * c) / a;
	}
 	else if (c < a && b > c) {
        ll t= (n - c) / b;
	   cout << (n - c) / b +  (n - t * c) / a;
    }
    return 0;
}

这题我在想的时候是用分类讨论做的，但是分类讨论比较的是a和b+c的大小这是错的，最终也就陷入这个陷阱了。这题实际需要结合图形来思考比较方便。然后一个一个针对子问题进行求解.