Delete Columns to Make Sorted LeetCode solution in C++

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class Solution {
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 public:
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  int minDeletionSize(vector<string> &strs) {
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    int col = strs[0].size();
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    int row = strs.size();
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    int count = 0;
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    for (int c = 0; c < col; c++) {
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      for (int r = 1; r < row; r++) {
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        if (strs[r][c] - strs[r - 1][c] < 0) {
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          count++;
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          break;
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        }
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      }
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    }
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    return count;
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  }
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};