#include <iostream>
#include<vector>
using namespace std;

vector<int>pairSum(vector<int>nums,int target){
    vector<int>ans;
    int n=nums.size();

    int i=0,j=n-1;

    while(i<j){
        int pairSum=nums[i]+nums[j];
        if (pairSum > target){
            j--;
        }else if(pairSum < target){
            i++;
        }else{
            ans.push_back(i);
            ans.push_back(j);
            return ans;
        }
    }

    return ans;
}

int main() {
    vector<int> nums={2,7,11,15};
    int target =26;


    vector<int>ans=pairSum(nums,target);
    cout << ans[0]<<" , " << ans[1] << endl;
    return 0;
}