题目https://ac.nowcoder.com/acm/contest/297/A链接
#include<stdio.h>
#include<string.h>
char a[10000];
int main()
{
int t;
scanf("%d",&t);
while(t--)
{
memset(a,0,sizeof(a));
scanf("%s",&a);
int d=strlen(a);
if((a[d-1]-'0')&1)
{
if(a[d-1]=='0')
{
a[d-2]=(a[d-2]-'1')+'0';a[d-1]='9'; }
else {
a[d-1]=(a[d-1]-'1')+'0';
}
}
for(int i=0;i<d;i++)
{
printf("%c",a[i]);
}
printf("\n");
}
return 0;
}