C++ 二次元array,vectorの最小値,最大値とそのインデックスの取得

vector<vector<int>> ary(n, vector<int>(n));
int MIN = INT_MAX;
int MAX = INT_MIN;

for (i = 0; i < n; i++) { 
          minx = min(minx, (int)*min_element(ary[i].begin(), ary[i].end()));
        　maxx = man(maxx, (int)*max_element(ary[i].begin(), ary[i].end()));
     
            if (*MIN > minx) {
                *MIN = minx;
                min_index= distance(ary[i].begin(), min_element(ary[i].begin(), ary[i].end()));
            }
            if (*MAX < maxx) {
                *MAX = maxx;
                max_index= distance(ary[i].begin(), max_element(ary[i].begin(), ary[i].end()));
            }
}