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leetcode
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724.cpp

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class Solution {
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public:
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int pivotIndex(vector<int>& nums) {
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int sum=0,lsum=0;
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for(int i=0;i<nums.size();i++){
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sum+=nums[i];
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}
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for(int i=0;i<nums.size();i++){
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sum-=nums[i];
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if(sum==lsum){
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return i;
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}
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lsum+=nums[i];
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}
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return -1;
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}
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};

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