hdoj 1287 破译密码

if(*it ^ c <'A' || *it ^ c >'Z')

if((int)(*it ^ c) <'A' || (int)(*it ^ c) >'Z')

#include<cstdio>
#include<vector>
using namespace std;

int main()
{
int N, num;
vector<int> vec;
//freopen("in.txt", "r", stdin);
while(scanf("%d", &N)==1)
{
vec.clear();
for(int i = 0; i < N; ++i)
{
scanf("%d", &num);
vec.push_back(num);
}

bool flag;
char c;
for(c='A'; c <='Z'; ++c)
{
flag = true;
for(vector<int>::iterator it = vec.begin(); it!=vec.end(); ++it)
{
if((int)(*it ^ c) <'A' || (int)(*it ^ c) >'Z')
{
flag = false;
break;
}
}

if(flag)
{
break;
}
}

for(vector<int>::iterator it = vec.begin(); it!=vec.end(); ++it)
{
printf("%c", *it ^ c);
}
printf("\n");
}

return 0;
}