class Solution {
public:
int maxProfit(vector<int> &prices) {
if( prices.size() == 0)
return 0;
int minv = prices[0];
int maxv = 0;
for( int i = 1 ; i < prices.size() ; i++ ) {
maxv = max(maxv,prices[i] - minv);
minv = min(minv,prices[i]);
}
return maxv;
}
};
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