Leetcode 806. Number of Lines To Write String

class Solution {
public:
    vector numberOfLines(vector& widths, string s) {
        int lines = 1;
        int curr_line = 0;
        for(auto& c : s){
            curr_line += widths[c-'a'];
            if(curr_line > 100){
                lines++;
                curr_line = widths[c-'a'];
            }
        }
        return {lines,curr_line};
    }
};