結果

問題 No.1340 おーじ君をさがせ
ユーザー 👑 KazunKazun
提出日時 2021-01-15 22:16:04
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 732 ms / 2,000 ms
コード長 6,774 bytes
コンパイル時間 142 ms
コンパイル使用メモリ 82,432 KB
実行使用メモリ 81,536 KB
最終ジャッジ日時 2024-05-05 21:48:25
合計ジャッジ時間 12,078 ms
ジャッジサーバーID
(参考情報)
judge4 / judge2
このコードへのチャレンジ
(要ログイン)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 48 ms
55,040 KB
testcase_01 AC 48 ms
54,912 KB
testcase_02 AC 42 ms
55,040 KB
testcase_03 AC 44 ms
54,912 KB
testcase_04 AC 42 ms
55,040 KB
testcase_05 AC 44 ms
54,656 KB
testcase_06 AC 43 ms
54,784 KB
testcase_07 AC 44 ms
55,168 KB
testcase_08 AC 43 ms
54,656 KB
testcase_09 AC 43 ms
54,912 KB
testcase_10 AC 63 ms
68,480 KB
testcase_11 AC 149 ms
76,288 KB
testcase_12 AC 82 ms
70,784 KB
testcase_13 AC 262 ms
77,952 KB
testcase_14 AC 254 ms
76,544 KB
testcase_15 AC 215 ms
76,416 KB
testcase_16 AC 71 ms
69,760 KB
testcase_17 AC 116 ms
76,288 KB
testcase_18 AC 151 ms
76,544 KB
testcase_19 AC 60 ms
66,432 KB
testcase_20 AC 56 ms
64,512 KB
testcase_21 AC 157 ms
76,416 KB
testcase_22 AC 732 ms
81,536 KB
testcase_23 AC 171 ms
76,544 KB
testcase_24 AC 542 ms
77,952 KB
testcase_25 AC 88 ms
76,544 KB
testcase_26 AC 75 ms
74,880 KB
testcase_27 AC 68 ms
71,936 KB
testcase_28 AC 87 ms
76,672 KB
testcase_29 AC 64 ms
70,144 KB
testcase_30 AC 162 ms
76,544 KB
testcase_31 AC 518 ms
77,824 KB
testcase_32 AC 528 ms
77,440 KB
testcase_33 AC 533 ms
77,568 KB
testcase_34 AC 459 ms
77,440 KB
testcase_35 AC 524 ms
77,440 KB
testcase_36 AC 50 ms
55,424 KB
testcase_37 AC 67 ms
67,456 KB
testcase_38 AC 530 ms
78,080 KB
testcase_39 AC 193 ms
76,928 KB
testcase_40 AC 187 ms
76,544 KB
testcase_41 AC 187 ms
76,672 KB
testcase_42 AC 51 ms
62,208 KB
testcase_43 AC 53 ms
62,080 KB
testcase_44 AC 59 ms
65,536 KB
testcase_45 AC 57 ms
63,104 KB
testcase_46 AC 157 ms
77,056 KB
testcase_47 AC 159 ms
76,544 KB
testcase_48 AC 170 ms
76,800 KB
testcase_49 AC 163 ms
76,288 KB
testcase_50 AC 166 ms
76,288 KB
testcase_51 AC 170 ms
76,416 KB
testcase_52 AC 266 ms
76,928 KB
testcase_53 AC 261 ms
76,416 KB
testcase_54 AC 261 ms
76,160 KB
testcase_55 AC 218 ms
76,800 KB
testcase_56 AC 52 ms
63,488 KB
testcase_57 AC 54 ms
63,360 KB
testcase_58 AC 46 ms
55,552 KB
testcase_59 AC 122 ms
76,672 KB
testcase_60 AC 43 ms
55,040 KB
testcase_61 AC 127 ms
76,544 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

from copy import copy,deepcopy

class Matrix_Error(Exception):
    pass

class Matrix():
    #入力
    def __init__(self,M=[]):
        self.ele=M
        R=len(M)
        if R!=0:
            C=len(M[0])
        else:
            C=0
        self.row=R
        self.col=C
        self.size=(R,C)

    #出力
    def __str__(self):
        T=""
        (r,c)=self.size
        for i in range(r):
            U="["
            for j in range(c):
                U+=str(self.ele[i][j])+" "
            T+=U[:-1]+"]\n"

        return "["+T[:-1]+"]"
    #+,-
    def __pos__(self):
        return self

    def __neg__(self):
        return self.__scale__(-1)

    #加法
    def __add__(self,other):
        A=self
        B=other
        if A.size!=B.size:
            raise Matrix_Error("2つの行列のサイズが異なります.({},{})".format(A.size,B.size))
        M=A.ele
        N=B.ele

        L=[]
        for i in range(A.row):
            E=[]
            for j in range(A.col):
                E.append(M[i][j]|N[i][j])

            L.append(E)
        return Matrix(L)

    #減法
    def __sub__(self,other):
        return self+(-other)

    #乗法
    def __mul__(self,other):
        A=self
        B=other
        if isinstance(B,Matrix):
            R=A.row
            C=B.col

            if A.col!=B.row:
                raise Matrix_Error("左側の列と右側の行が一致しません.({},{})".format(A.size,B.size))
            G=A.col

            M=A.ele
            N=B.ele

            E=[]
            for i in range(R):
                F=[]
                for j in range(C):
                    S=0
                    for k in range(G):
                        S|=M[i][k]&N[k][j]
                    F.append(S)
                E.append(F)

            return Matrix(E)

        elif isinstance(B,int):
            return A.__scale__(B)

    def __rmul__(self,other):
        if isinstance(other,int):
            return self*other

    def Inverse(self):
        from copy import copy
        M=self
        if M.row!=M.col:
            raise Matrix_Error("正方行列ではありません.")

        R=M.row
        I=[[1*(i==j) for j in range(R)] for i in range(R)]
        G=M.Column_Union(Matrix(I))
        G=G.Row_Reduce()

        A,B=[],[]
        for i in range(R):
            A.append(copy(G.ele[i][:R]))
            B.append(copy(G.ele[i][R:]))

        if A==I:
            return Matrix(B)
        else:
            raise Matrix_Error("正則ではありません.")

    #スカラー倍
    def __scale__(self,r):
        M=self.ele
        L=[[r*M[i][j] for j in range(self.col)] for i in range(self.row)]
        return Matrix(L)

    #累乗
    def __pow__(self,n):
        A=self
        if A.row!=A.col:
            raise Matrix_Error("正方行列ではありません.")

        if n<0:
            return (A**(-n)).Inverse()

        R=Matrix([[1*(i==j) for j in range(A.row)] for i in range(A.row)])
        D=A

        while n>0:
            if n%2==1:
                R*=D
            D*=D
            n=n>>1

        return R

    #等号
    def __eq__(self,other):
        A=self
        B=other
        if A.size!=B.size:
            return False

        for i in range(A.row):
            for j in range(A.col):
                if A.ele[i][j]!=B.ele[i][j]:
                    return False

        return True

    #不等号
    def __neq__(self,other):
        return not(self==other)

    #転置
    def Transpose(self):
        self.col,self.row=self.row,self.col
        self.ele=list(map(list,zip(*self.ele)))

    #行基本変形
    def Row_Reduce(self):
        M=self
        (R,C)=M.size
        T=[]

        for i in range(R):
            U=[]
            for j in range(C):
                U.append(M.ele[i][j])
            T.append(U)

        I=0
        for J in range(C):
            if T[I][J]==0:
                for i in range(I+1,R):
                    if T[i][J]!=0:
                        T[i],T[I]=T[I],T[i]
                        break

            if T[I][J]!=0:
                u=T[I][J]
                for j in range(C):
                    T[I][j]/=u

                for i in range(R):
                    if i!=I:
                        v=T[i][J]
                        for j in range(C):
                            T[i][j]-=v*T[I][j]
                I+=1
                if I==R:
                    break

        return Matrix(T)

    #列基本変形
    def Column_Reduce(self):
        M=self
        (R,C)=M.size

        T=[]
        for i in range(R):
            U=[]
            for j in range(C):
                U.append(M.ele[i][j])
            T.append(U)

        J=0
        for I in range(R):
            if T[I][J]==0:
                for j in range(J+1,C):
                    if T[I][j]!=0:
                        for k in range(R):
                            T[k][j],T[k][J]=T[k][J],T[k][j]
                        break

            if T[I][J]!=0:
                u=T[I][J]
                for i in range(R):
                    T[i][J]/=u

                for j in range(C):
                    if j!=J:
                        v=T[I][j]
                        for i in range(R):
                            T[i][j]-=v*T[i][J]
                J+=1
                if J==C:
                    break

        return Matrix(T)

    #行列の階数
    def Rank(self,ep=None):
        M=self.Row_Reduce()
        (R,C)=M.size
        T=M.ele

        S=0
        for i in range(R):
            f=False
            if ep==None:
                for j in range(C):
                    if T[i][j]!=0:
                        f=True
            else:
                for j in range(C):
                    if abs(T[i][j])>=ep:
                        f=True

            if f:
                S+=1
            else:
                break

        return S

    #行の結合
    def Row_Union(self,other):
        return Matrix(self.ele+other.ele)

    #列の結合
    def Column_Union(self,other):
        E=[]
        for i in range(self.row):
            E.append(self.ele[i]+other.ele[i])

        return Matrix(E)

    def __getitem__(self,index):
        assert isinstance(index,tuple) and len(index)==2
        return self.ele[index[0]][index[1]]

    def __setitem__(self,index,val):
        assert isinstance(index,tuple) and len(index)==2
        self.ele[index[0]][index[1]]=val
#================================================
import sys
input=sys.stdin.readline

N,M,T=map(int,input().split())

X=Matrix([[0]*N for _ in range(N)])

for _ in range(M):
    a,b=map(int,input().split())
    X[b,a]=1

v=X**T*Matrix([[1 if i==0 else 0] for i in range(N)])

K=0
for i in range(N):
    if v[i,0]:
        K+=1
print(K)
0