ABC420のB問題のコード修正をお願いします。

#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)
using ll = long long; using ld = long double;

int main() {
    ll n,m; cin >> n >> m;
    vector<ll> point(n,0);

    //ここの読み取りをlong longからcharに変更
    vector<vector<char>> masu(n,vector<char> (m));
    rep(i,0,n)rep(j,0,m) cin >> masu[i][j];

    ll cnt1 = 0, cnt0 = 0;
    vector<ll> index0,index1;
    rep(j,0,m) {
        index1.clear();
        index0.clear();
        cnt0 = 0;
        cnt1 = 0;
        rep(i,0,n) {
            //文字で受け取っているので''を付けて文字で比較
            if(masu[i][j] == '0') cnt0++,index0.push_back(i);
            else if(masu[i][j] == '1') cnt1++,index1.push_back(i);
        }
        if(cnt0 == 0 || cnt1 == 0) rep(i,0,point.size()) point[i]++;
        else if(cnt0 < cnt1) rep(i,0,index0.size()) point[index0[i]]++;
        else if(cnt0 > cnt1) rep(i,0,index1.size()) point[index1[i]]++;
    }

    //以降そのまま
    //sort(point.begin(),point.end(),greater<ll>());
    auto& ans = *max_element(point.begin(),point.end());
    rep(i,0,point.size()) {
        if(point[i] == ans) {
        cout << i+1 << " ";
      }
    }
    cout << endl;
    return 0;
}