Errorenous result using comparsion operator in c++ Vector

This is a interesting problem I faced while solving an algorthmic problem. Using if and ">" operator gives erroneous output while std::max or initialzing with first element works.

Trying to find largest element and smallest element in array:

  {
     vector<int> plus{89, -83, 38, 58, 79, -80, 8, 19, 31, -95};
    int plus_max = INT_MIN;
    int plus_min = INT_MAX;
        for(int i=1;i<N;i++){
            if(plus[i]<plus_min)
               plus_min = plus[i];
            else if(plus[i]>plus_max)
               plus_max = plus[i];
         }
  }

It gives output plus_max as 79(second largest) rather than 89 and plus_min as -95(CORRECT) but using max or initializing with first element and looping from second element works.

  {
     vector<int> plus{89, -83, 38, 58, 79, -80, 8, 19, 31, -95};
     int plus_max = INT_MIN;
     int plus_min = INT_MAX;
        for(int i=1;i<N;i++){

               plus_min = min(plus[i],plus_min);

               plus_max = max(plus[i],plus_max);
         }
  }

I am unable to figure out why.