View difference between Paste ID: W5FwGYBa and 3VF7My9N

 #include <iostream>
 #include <fstream>
 #include <string>
 #include <vector>
 #include <algorithm>
 #include <cstdint>
 
 using namespace std;
 
 class Matrix
 {
 public:
   Matrix(uint16_t _n, uint16_t _m)
     : n(_n)
     , m(_m)
   {
     data = new std::uint16_t[n*m];
   }
 
   ~Matrix() { delete[] data; }
 
   uint16_t &at(int i, int j) { return data[m*i + j]; }
 
 private:
   uint16_t *data, n, m;
 };
 
 vector<string> linesFromFile(const char *path);
 
 int main(int argc, char **argv)
 {
   auto lines1 = linesFromFile(argv[1]);
   auto lines2 = linesFromFile(argv[2]);
   int n = lines1.size(),
       m = lines2.size();
 
   Matrix mat(n, m);
   for(int i = 1; i < n; i++)
   {
     for(int j = 1; j < m; j++)
     {
       uint16_t a = mat.at(i-1, j),
                b = mat.at(i, j-1),
                c = (mat.at(i-1, j-1) + 1) * uint16_t(lines1[i-1] == lines2[j-1]);
       mat.at(i, j) = max({a, b, c});
     }
   }
 
   vector<string> diff;
   int i = n-1, j = m-1;
 
   if(lines1[i] == lines2[j])
   {
-    diff.push_back("  " + lines1[i]);
+    diff.push_back("\e[37m" + lines1[i]);
   }
   else
   {
-    diff.push_back("- " + lines1[i]);
+
-    diff.push_back("+ " + lines2[j]);
+
   }
 
   while(i > 0 && j > 0)
   {
     auto a = mat.at(i-1, j);
     auto b = mat.at(i, j-1);
     auto c = (mat.at(i-1, j-1) + 1) * uint16_t(lines1[i-1] == lines2[j-1]);
     if(mat.at(i, j) == a)
     {
       i--;
       diff.push_back("\e[31m" + lines1[i]);
     }
     else if(mat.at(i, j) == b)
     {
       j--;
       diff.push_back("\e[32m" + lines2[j]);
     }
     else
     {
       i--;
       j--;
       diff.push_back("\e[37m" + lines1[i]);
     }
   }
 
   while(i > 0)
   {
     i--;
     diff.push_back("\e[31m" + lines1[i]);
   }
 
   while(j > 0)
   {
     j--;
     diff.push_back("\e[32m" + lines2[j]);
   }
 
   for_each(diff.rbegin(), diff.rend(), [](auto &s){cout << s << endl;});
 
   cout << "\e[0m";
 }
 
 vector<string> linesFromFile(const char *path)
 {
   vector<string> ret;
 
   ifstream file(path);
   while(!file.eof())
   {
     string line;
     getline(file, line);
     ret.push_back(line);
   }
   file.close();
 
   return ret;
 }