2019牛客暑期多校訓練營（第十場） D Han Xin and His Troops python3+中國剩餘定理

題意：就是中國剩餘定理

題解：寫上板子之後過不去，很奇怪，然後發現卡大數。。。。

python走一波！
 

x=0;y=0
def mul(a,b,m)-> int:
    return int(a*b%m)
def exgcd(a,b)-> int:
    global x, y
    if(b==0):
        x=1
        y=0
        return a
    gcd=exgcd(b,a%b)
    tp=x
    x=y
    y=tp-a//b*y
    return gcd
def excrt(ai,bi,n)-> int:
    global x,y
    M=bi[1]
    ans=ai[1]
    for i in range(2,n+1):
        a=M
        b=bi[i]
        c=(ai[i]-ans%b+b)%b
        gcd=exgcd(a,b)
        bg=b//gcd
        #print(c%gcd)
        if(c%gcd!=0):
            return -1
        x=mul(x,c//gcd,bg)
        ans+=x*M
        M*=bg
        ans=(ans%M+M)%M
    return (ans%M+M)%M
n,m=map(int,input().split())
ai=[0]
bi=[0]
for i in range(1,n+1):
    aa,bb=map(int,input().split())
    ai.append(aa)
    bi.append(bb)
ans = excrt(bi,ai,n)
if ans==-1:
    print("he was definitely lying")
elif ans>m:
    print("he was probably lying")
else:
    print(int(ans))