题解 | 邮票

#include<bits/stdc++.h>
using namespace std;
vector<float> money;
set<float> myset;
int main() {

    float arr[] = {0.8, 0.8, 0.8, 0.8, 0.8, 1.0, 1.0, 1.0, 1.0, 1.8, 1.8, 1.8, 1.8, 1.8, 1.8};

    money.push_back(0);
    for (int i = 1; i < 15; i++) {
        int len = money.size();
        for (int j = 0; j < len; j++) {
            money.push_back(arr[i] + money[j]);
        }
    }

    for (int j = 0; j < money.size(); j++) {
        myset.insert(money[j]);
    }
    cout << myset.size();
}