CodeForces 180C Letter

 1 // File Name: 180c.cpp
 2 // Author: darkdream
 3 // Created Time: 2015年03月21日 星期六 08时40分08秒
 4 
 5 #include<vector>
 6 #include<list>
 7 #include<map>
 8 #include<set>
 9 #include<deque>
10 #include<stack>
11 #include<bitset>
12 #include<algorithm>
13 #include<functional>
14 #include<numeric>
15 #include<utility>
16 #include<sstream>
17 #include<iostream>
18 #include<iomanip>
19 #include<cstdio>
20 #include<cmath>
21 #include<cstdlib>
22 #include<cstring>
23 #include<ctime>
24 #define LL long long
25 
26 using namespace std;
27 int big;
28 int small;
29 char str[100500];
30 int main(){
31     scanf("%s",str);
32     int len = strlen(str);
33     for(int i = 0 ;i < len; i ++)
34     {
35         if(str[i] <= ‘Z‘)
36           big ++ ; 
37         else 
38           small ++;
39     }
40     int mi = min(big,small) ;
41     int tbig,tsmall;
42     tbig = tsmall = 0;
43     for(int i = 0 ;i < len;i ++)
44     {
45         if(str[i] <= ‘Z‘)
46             tbig ++ ; 
47         else tsmall ++ ; 
48         mi = min(mi,tsmall+big - tbig);
49     }
50     printf("%d\n",mi);
51 return 0;
52 }