Competitive-Programming/StringComputer9.cpp at master · srinivas9804/Competitive-Programming · GitHub

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#include <iostream>
#include <sstream>
#include <string>
using namespace std;
int arr[22][22];//max number of characters;
int from[22][22];//for backtracking. 1-go up. 2-go left. 3. up and left
string str1;
string str2;
int main() {
	while (cin >> str1) {
		if (str1[0] == '#')
			return 0;
		cin >> str2;
		int n = str1.length();
		int m = str2.length();
		for (int i = 0; i <= n; i++) {
			for (int j = 0; j <= m; j++) {
				arr[i][j] = 0;
				from[i][j] = 0;
			}
		}
		for (int i = 0; i <= n; i++) {
			for (int j = 0; j <= m; j++) {
				if (i == 0) {
					arr[i][j] = j;
					from[i][j] = 1;
				}
				else if (j == 0) {
					arr[i][j] = i;
					from[i][j] = 2;
				}
				else {
					if (arr[i - 1][j] < arr[i][j - 1]) {
						if (arr[i - 1][j] < arr[i - 1][j - 1]) {
							arr[i][j] = arr[i - 1][j];
							from[i][j] = 2;//delete character
						}
						else {
							arr[i][j] = arr[i - 1][j - 1];
							from[i][j] = 3;//change
						}
					}
					else {
						if (arr[i][j - 1] < arr[i - 1][j - 1]) {
							arr[i][j] = arr[i][j - 1];
							from[i][j] = 1;//insert
						}
						else {
							arr[i][j] = arr[i - 1][j - 1];
							from[i][j] = 3;
						}
					}
					arr[i][j]++;
					if (str1[i - 1] == str2[j - 1] && from[i][j] == 3) {
						from[i][j] = 0;
						arr[i][j]--;
					}
				}
			}
		}
		string output = "E";
		while (!(m == 0 && n == 0)) {
			if (from[n][m] == 0) {
				m = m - 1;
				n = n - 1;
				continue;
			}
			else if (from[n][m] == 2) {
				string temp = "D";
				temp += str1[n - 1];
				stringstream ss;
				if (m + 1 < 10)
					temp += '0';
				ss << (m+1);
				temp += ss.str();
				output = temp + output;
				n = n - 1;
			}
			else if (from[n][m] == 1) {
				string temp = "I";
				temp += str2[m - 1];
				stringstream ss;
				if (m  < 10)
					temp += '0';
				ss << m;
				temp += ss.str();
				output = temp + output;
				m = m - 1;
			}
			else {
				string temp = "C";
				temp+= str2[m - 1];
				stringstream ss;
				if (m  < 10)
					temp += '0';
				ss << m;
				temp += ss.str();
				output = temp + output;
				m = m - 1;
				n = n - 1;
			}
		}
		cout << output << endl;
	}
	return 0;
}