面试题44之扑克牌的顺子_ContinousCards.cpp

// ContinousCards.cpp : Defines the entry point for the console application.
//

// 《剑指Offer——名企面试官精讲典型编程题》代码
// 著作权所有者：何海涛

#include "stdafx.h"
#include <stdlib.h>

int compare(const void *arg1, const void *arg2);

bool IsContinuous(int* numbers, int length)
{
    if(numbers == NULL || length < 1)
        return false;
 
    qsort(numbers, length, sizeof(int), compare);
 
    int numberOfZero = 0;
    int numberOfGap = 0;
 
    // 统计数组中0的个数
    for(int i = 0; i < length && numbers[i] == 0; ++i)
        ++ numberOfZero;

    // 统计数组中的间隔数目
    int small = numberOfZero;
    int big = small + 1;
    while(big < length)
    {
        // 两个数相等，有对子，不可能是顺子
        if(numbers[small] == numbers[big])
            return false;

        numberOfGap += numbers[big] - numbers[small] - 1;
        small = big;
        ++big;
    }
 
    return (numberOfGap > numberOfZero) ? false : true; 
}

int compare(const void *arg1, const void *arg2)
{
   return *(int*)arg1 - *(int*)arg2;
}

// ====================测试代码====================
void Test(char* testName, int* numbers, int length, bool expected)
{
    if(testName != NULL)
        printf("%s begins: ", testName);

    if(IsContinuous(numbers, length) == expected)
        printf("Passed.\n");
    else
        printf("Failed.\n");
}

void Test1()
{
    int numbers[] = {1, 3, 2, 5, 4};
    Test("Test1", numbers, sizeof(numbers) / sizeof(int), true);
}

void Test2()
{
    int numbers[] = {1, 3, 2, 6, 4};
    Test("Test2", numbers, sizeof(numbers) / sizeof(int), false);
}

void Test3()
{
    int numbers[] = {0, 3, 2, 6, 4};
    Test("Test3", numbers, sizeof(numbers) / sizeof(int), true);
}

void Test4()
{
    int numbers[] = {0, 3, 1, 6, 4};
    Test("Test4", numbers, sizeof(numbers) / sizeof(int), false);
}

void Test5()
{
    int numbers[] = {1, 3, 0, 5, 0};
    Test("Test5", numbers, sizeof(numbers) / sizeof(int), true);
}

void Test6()
{
    int numbers[] = {1, 3, 0, 7, 0};
    Test("Test6", numbers, sizeof(numbers) / sizeof(int), false);
}

void Test7()
{
    int numbers[] = {1, 0, 0, 5, 0};
    Test("Test7", numbers, sizeof(numbers) / sizeof(int), true);
}

void Test8()
{
    int numbers[] = {1, 0, 0, 7, 0};
    Test("Test8", numbers, sizeof(numbers) / sizeof(int), false);
}

void Test9()
{
    int numbers[] = {3, 0, 0, 0, 0};
    Test("Test9", numbers, sizeof(numbers) / sizeof(int), true);
}

void Test10()
{
    int numbers[] = {0, 0, 0, 0, 0};
    Test("Test10", numbers, sizeof(numbers) / sizeof(int), true);
}

// 有对子
void Test11()
{
    int numbers[] = {1, 0, 0, 1, 0};
    Test("Test11", numbers, sizeof(numbers) / sizeof(int), false);
}

// 鲁棒性测试
void Test12()
{
    Test("Test12", NULL, 0, false);
}

int _tmain(int argc, _TCHAR* argv[])
{
    Test1();
    Test2();
    Test3();
    Test4();
    Test5();
    Test6();
    Test7();
    Test8();
    Test9();
    Test10();
    Test11();
    Test12();

    return 0;
}