Update EDIT - Edit Distance Again.cpp

Author: AliOsm

SPOJ/EDIT - Edit Distance Again.cpp

@@ -1,66 +1,48 @@
-#include <iostream>
-#include <string>
-#include <algorithm>
+#include <bits/stdc++.h>
 
 using namespace std;
 
-void calc(int &cc, string s) {
- char a, b, c;
- 
- for(int i = 1; i < s.size() - 1; i++) {
- a = s[i];
- b = s[i+1];
- c = s[i-1];
- 
- if(!((a >= 'a' && a <= 'z') && (b == ' ' || (b >= 'A' && b <= 'Z')) && (c == ' ' || (c >= 'A' && c <= 'Z'))) || !((a >= 'A' && a <= 'Z') && (b == ' ' || (b >= 'a' && b <= 'z')) && (c == ' ' || (c >= 'a' && c <= 'z')))) {
- if((c >= 'a' && c <= 'z' && a >= 'a' && a <= 'z') || (c >= 'A' && c <= 'Z' && a >= 'A' && a <= 'Z')) {
- if(islower(s[i])) s[i] = toupper(s[i]);
- else s[i] = tolower(s[i]);
- a = s[i];
- cc++;
- }
- 
- if((b >= 'a' && b <= 'z' && a >= 'a' && a <= 'z') || (b >= 'A' && b <= 'Z' && a >= 'A' && a <= 'Z')) {
- if(islower(s[i+1])) s[i+1] = toupper(s[i+1]);
- else s[i+1] = tolower(s[i+1]);
- b = s[i];
- cc++;
- }
- }
- }
+int const N = 1e3 + 1;
+int dp[N][2];
+string s;
+
+int rec(int i, bool c) {
+if(i == s.length()) {
+return 0;
+}
+
+int &res = dp[i][c];
+if(res != -1) {
+return res;
+}
+res = 1e9;
+
+if(c) {
+if(islower(s[i])) {
+res = min(res, rec(i + 1, false));
+} else {
+res = min(res, rec(i + 1, true) + 1);
+}
+} else {
+if(islower(s[i])) {
+res = min(res, rec(i + 1, false) + 1);
+} else {
+res = min(res, rec(i + 1, true));
+}
+}
+
+return res;
 }
 
 int main() {
- string s;
- int cc1, cc2;
- 
- while(cin >> s) {
- if(s.size() == 1)
- cout << 0 << endl;
- else if(s.size() == 2) {
- char a, b;
- 
- a = s[0];
- b = s[1];
- 
- if((a >= 'a' && a <= 'z' && b >= 'a' && b <= 'z') || (a >= 'A' && a <= 'Z' && b >= 'A' && b <= 'Z'))
- cout << 1 << endl;
- else
- cout << 0 << endl;
- } else {
- cc1 = 0;
- cc2 = 1;
- 
- calc(cc1, s);
- 
- if(islower(s[0])) s[0] = toupper(s[0]);
- else s[0] = tolower(s[0]);
- 
- calc(cc2, s);
- 
- cout << min(cc1, cc2) << endl;
- }
- }
- 
- return 0;
+#ifndef ONLINE_JUDGE
+freopen("input.in", "r", stdin);
+#endif
+
+while(cin >> s) {
+memset(dp, -1, sizeof dp);
+cout << rec(0, islower(s[0])) << endl;
+}
+
+return 0;
 }