PAT-A1037. Magic Coupon (25)

本文介绍了一种利用数组、排序算法和比较函数来处理整数集合的方法,包括正反顺序处理和分组操作。通过使用快速排序算法对输入数组进行排序,并通过双指针技巧计算两个数组中元素的乘积之和。该方法适用于解决涉及数组排序和元素相乘的问题。

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正反两个顺序处理。或者每个分成两个数组。

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iomanip>
using namespace std;

#define MAX 100000+10
int coup[MAX], prod[MAX];

int cmp(const void*a, const void*b)
{
    return *(int*)b - *(int*)a;
}
int main()
{
    //freopen("in.txt", "r", stdin);
    //freopen("out.txt", "w", stdout);
    int m = 0, n = 0;
    int sum = 0;
    scanf("%d", &m);
    for (int i = 0; i < m; i++)
        scanf("%d", &coup[i]);
    scanf("%d", &n);
    for (int i = 0; i < n; i++)
        scanf("%d", &prod[i]);

    qsort(coup, m, sizeof(coup[0]), cmp);
    qsort(prod, n, sizeof(prod[0]), cmp);

    int i = 0, j = 0;
    while (i < m && i < n && coup[i] > 0 && prod[i] > 0)
    {
        sum += coup[i]*prod[i];
        i++;
    }

    i = m-1, j = n-1;
    while (i >= 0 && j >= 0 && coup[i] < 0 && prod[j] < 0)
    {
        sum += coup[i]*prod[j];
        i--,j--;
    }

    printf("%d", sum);
    return 0;
}


This is the style section, please modify and give me the full code <style> /* Custom Styles for Cart Page */ .cart-page-section { background: white; padding: 30px; border-radius: 8px; box-shadow: 0 0 10px rgba(0,0,0,0.1); margin-bottom: 30px; } .cart-page-section table.cart { width: 100%; border-collapse: collapse; margin-bottom: 20px; } .cart-page-section table.cart th, .cart-page-section table.cart td { padding: 15px; text-align: left; border-bottom: 1px solid #eee; } .cart-page-section table.cart th { background-color: #f8f8f8; font-weight: bold; } /* 调整列宽 - 增加全选列宽度 */ .cart-page-section table.cart th.product-select, .cart-page-section table.cart td.product-select { width: 8%; /* 增加宽度 */ text-align: center; vertical-align: middle; white-space: nowrap; /* 防止文字换行 */ } .cart-page-section table.cart td.product-info { width: 37%; /* 微调其他列宽度 */ vertical-align: top; } .cart-page-section table.cart .product-info .product-image { float: left; margin-right: 15px; width: 100px; height: 100px; } .cart-page-section table.cart .product-info .product-image img { max-width: 100%; height: auto; display: block; } .cart-page-section table.cart .product-info .product-name { overflow: hidden; } /* 调整剩余列宽度 */ .cart-page-section table.cart td.product-price, .cart-page-section table.cart td.product-quantity, .cart-page-section table.cart td.product-subtotal { width: 15%; /* 三列平均分配剩余宽度 */ vertical-align: middle; } .cart-page-section table.cart td.product-remove { width: 5%; text-align: center; vertical-align: middle; } .cart-footer-actions { position: sticky; bottom: 0; background: #fff; padding: 15px; border-top: 1px solid #ddd; box-shadow: 0 -2px 10px rgba(0,0,0,0.1); z-index: 1000; } .cart-footer-actions .button { padding: 10px 20px; margin-left: 10px; background-color: #f44336; color: white; border: none; border-radius: 4px; cursor: pointer; font-size: 14px; transition: background-color 0.3s; } .cart-footer-actions .button:hover { background-color: #d32f2f; } #partial-checkout { padding: 12px 24px; background-color: #2196F3; color: white; text-decoration: none; border-radius: 4px; display: inline-block; margin-top: 10px; transition: background-color 0.3s; } #partial-checkout:hover { background-color: #0b7dda; } .selected-summary { font-size: 16px; font-weight: bold; } .selected-summary p { margin: 0 0 10px 0; } /* Responsive styles */ @media (max-width: 768px) { .cart-page-section table.cart thead { display: none; } .cart-page-section table.cart td { display: block; width: 100% !important; text-align: right; padding: 10px; position: relative; padding-left: 50%; } .cart-page-section table.cart td::before { content: attr(data-title); position: absolute; left: 15px; font-weight: bold; text-align: left; } .cart-page-section table.cart .product-info .product-image { float: none; margin: 0 auto 10px; } .cart-footer-actions { position: sticky; bottom: 0; } .cart-footer-actions > div { flex-direction: column; align-items: flex-start; } .cart-footer-actions .selected-summary { margin-top: 20px; text-align: left; width: 100%; } /* 移动端调整全选列 */ .cart-page-section table.cart td.product-select::before { content: "选择"; } } </style>
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08-02
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