class Solution {
public:
//A[i] + i + A[j] - j
int maxScoreSightseeingPair(vector<int>& A) {
int maxAdd = A[0] + 0;
int res = INT_MIN;
for(int i = 1; i < A.size(); ++i)
{
res = max(res, maxAdd + A[i] - i);
maxAdd = max(maxAdd, A[i] + i);
}
return res;
}
};
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