这个题写了一页式子qaq(还看了题解
刚开始在luogu AC了但在BZOJ CE了
看不懂不想看但感觉是abs的锅, 自己定义了一个abs就好了QAQ
dalao告诉我gcd的时候else 也要加return , 最后加个return 0
这样:
而不是:
(虽然这样也能过qwq
我的证明:
哈哈哈哈哈哈哈哈哈就是这么草率qwq
代码:
1 #include2 #include 3 #define ll long long 4 using namespace std; 5 ll n, a, b, x, y, mid, sum; 6 ll read() { 7 char ch = getchar(); ll x = 0, f = 1; 8 while(ch > '9' || ch < '0') { if(ch == '-') f = -1; ch = getchar();} 9 while(ch >= '0' && ch <= '9') {x = x * 10 + ch - '0' ; ch = getchar();}10 return x * f;11 }12 ll absabs(ll x) {13 if(x < 0) return -x;14 if(x >= 0) return x;15 }16 ll gcd(ll a, ll b) {17 if(a < 0) a = -a;18 if(b < 0) b = -b;19 if(!b) return a;20 else else gcd(b, a % b);21 return 0;22 }23 int main() {24 scanf("%lld", &n);25 while(n--) {26 bool flag = 0;27 a = read(), b = read(), x = read(), y = read();28 mid = gcd(a*a - b*b, a*a + b*b);29 sum = gcd(mid, 2*a*b);30 ll o = absabs(a*y-b*x), s = absabs(b*y-a*x), t = absabs(a*y+b*x), f = absabs(b*y+a*x);//这里如果直接放到下面判断会报错QAQ窝也不知道为什么QAQ31 if(o % sum != 0) flag = 1;32 if(s % sum != 0) flag = 1;33 if(t % sum != 0) flag = 1;34 if(f % sum != 0) flag = 1;35 if(flag) printf("N\n");36 else printf("Y\n");37 }38 return 0;39 }
加油加油!!!!!!!!!!!!!