hdu6130(我的代码如下，一直WA)

[vectorX]

#include<cstdio>
#define Maxn int(1e7+1)
#pragma warning(disable:4996)

using namespace std;

int ka[Maxn];
void init() {
int k=3;
ka[1] = 1;
ka[2] = 2;
ka[3] = 2;
for (int i = 3; i <= Maxn;)
{
if (ka[k] == 1) { ka[++i] = ka[i] == 1 ? 2 : 1; }
else { ka[++i] = ka[++i] = ka[i] == 1 ? 2 : 1; }
k++;
}
}

int T;
int n;
int main() {
init();
scanf("%d", &T);
// freopen("output.txt", "w", stdout);
while (T--) {
scanf("%d", &n);
if(T)
printf("%d\n", ka[n]);
else
printf("%d", ka[n]);
}
}

[Really_want]

我用你的代码编译，警告信息如下：

一类是unknown-pragmas，参考：https://community.rti.com/kb/why-do-i-see-warnings-about-undefined-pragmas-headers-during-compilation
一类是sequence-point，参考：http://www.cnblogs.com/Levins/archive/2004/11/25/68572.html

[赵4老师]

边界条件 输入输出格式 ……

[vectorX]

引用 2 楼 Really_want的回复:

我用你的代码编译，警告信息如下：

一类是unknown-pragmas，参考：https://community.rti.com/kb/why-do-i-see-warnings-about-undefined-pragmas-headers-during-compilation
一类是sequence-point，参考：http://www.cnblogs.com/Levins/archive/2004/11/25/68572.html

我电脑这几天上博客，以为不会这么快收到回应， 谢谢你的细致专业的回复

[自信男孩]

#include<cstdio>
#define Maxn int(1e7+1)
#pragma warning(disable:4996)

using namespace std;

int ka[Maxn];
void init()
{
    int k=3;
    ka[1] = 1;
    ka[2] = 2;
    ka[3] = 2;
    for (int i = 3; i <= Maxn;)
    {
        if (ka[k] == 1) {
            ka[i+1] = (ka[i] == 1) ? 2 : 1;
            i++;
        }
        else {
            ka[i+1] = ka[i+2] = (ka[i] == 1) ? 2 : 1;
            i += 2;
        }
        k++;
    }
}

int T;
int n;
int main()
{
    init();
    scanf("%d", &T);
    // freopen("output.txt", "w", stdout);
    while (T--) {
        scanf("%d", &n);
        if(T)
            printf("%d\n", ka[n]);
        else
            printf("%d", ka[n]);
    }
}

注意前自增和后自增都会有副作用，建议你的init函数里的逻辑改一下。