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// 121. Best Time to Buy and Sell Stock
#include <limits.h>
#include <stdio.h>
/*
* given an array 'prices' where 'prices[i]' is the price of a given stock on
* the ith day. maximise profit by choosing a single day to buy one stock and
* choosing a diff day in future to sell stock. return maximum profit achievable
* from transaction.
*/
int maxProfit(int *prices, int pricesSize) {
int lsf = INT_MAX, op = 0, pist = 0;
for (int i = 0; i < pricesSize; i++) {
if (prices[i] < lsf)
lsf = prices[i];
pist = prices[i] - lsf;
if (op < pist)
op = pist;
}
return op;
}
int main() {
int p1[] = {7, 1, 5, 3, 6, 4}, p2[] = {7, 6, 4, 3, 1};
printf("%d\n", maxProfit(p1, 6)); // expect: 5
printf("%d\n", maxProfit(p2, 5)); // expect: 0
}
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