【C++ 刷题必备技巧】

1. 数组查找最大和最小值

auto min_buy_price= min_element(prices.begin(),prices.begin()+i);
profit = prices[i]-*min_buy_price;

2. INT类型的最大和最小值
   INT_MIN 在实际使用的时候要考虑更多细节
   比如:

# define INT8_MIN		(-128)
# define INT16_MIN		(-32767-1)
# define INT32_MIN		(-2147483647-1)
# define INT64_MIN		(-__INT64_C(9223372036854775807)-1)
/* Maximum of signed integral types.  */
# define INT8_MAX		(127)
# define INT16_MAX		(32767)
# define INT32_MAX		(2147483647)
# define INT64_MAX		(__INT64_C(9223372036854775807))

/* Maximum of unsigned integral types.  */
# define UINT8_MAX		(255)
# define UINT16_MAX		(65535)
# define UINT32_MAX		(4294967295U)
# define UINT64_MAX		(__UINT64_C(18446744073709551615))