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for a=1 to 1
for b=1 to 2
for c=0 to 9
for d=0 to 9
if c+d=>10 then goto 50
for e=0 to 9
for f=0 to 9
if e+f=>10 then goto 30
for g=0 to 9
for h=0 to 9
if g+h=>10 or 1000*a+100*c+10*e+g+1<>1000*b+100*d+10*f+h then goto 10
print 1000*a+100*c+10*e+g
10 next h
20 next g
30 next f
40 next e
50 next d
60 next c
70 next b
80 next a
end

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1000,1001,1002,1003,1004,1009,1010,1011,1012,1013,1014,1019,1020,1021,1022,1023,1024,1029,1030,10311032,1033,1034,1039,1040,1041,1042,1043,1044,1049,1099,1100,1101,1102,1103,1104,1109,1110,1111,11121113,1114,1119,1120,1121,1122,1123,1124,1129,1130,1131,1132,1133,1134,1139,1140,1141,1142,1143,11441149,1199,1200,1201,1202,1203,1204,1209,1210,1211,1212,1213,1214,1219,1220,1221,1222,1223,1224,12291230,1231,1232,1233,1234,1239,1240,1241,1242,1243,1244,1249,1299,1300,1301,1302,1303,1304,1309,13101311,1312,1313,1314,1319,1320,1321,1322,1323,1324,1329,1330,1331,1332,1333,1334,1339,1340,1341,13421343,1344,1349,1399,1400,1401,1402,1403,1404,1409,1410,1411,1412,1413,1414,1419,1420,1421,1422,14231424,1429,1430,1431,1432,1433,1434,1439,1440,1441,1442,1443,1444,1449,1499,1999 ¤òÍåÎó¡ª
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FOR a = 1000 TO 1999
LET b = a+1
LET a$ = STR$(a)
LET b$ = STR$(b)
IF VAL(mid$(a$,1,1)) + VAL(mid$(b$,1,1)) <= 9 AND &
& VAL(mid$(a$,2,1)) + VAL(mid$(b$,2,1)) <= 9 AND &
& VAL(mid$(a$,3,1)) + VAL(mid$(b$,3,1)) <= 9 AND &
& VAL(mid$(a$,4,1)) + VAL(mid$(b$,4,1)) <= 9 THEN LET count = count+1
NEXT A
PRINT count
END
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DSi¤Îsmile basic
KOTAE=0
FOR A=1000 TO 1999
B=A+1
DAME=0
FOR J=1 TO 4
IF VAL(MID$(STR$(A),J,1))+VAL(MID$(STR$(B),J,1))>9 THEN DAME=1
NEXT J
IF DAME=0 THEN KOTAE=KOTAE+1:PRINT KOTAE;":";A;",";B
NEXT A
END
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(1) 0 <= c <= 8 ¤Î¾ì¹ç
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1 ·åÌÜ¡§1 <= c + c + 1 <= 9 ¤Ê¤Î¤Ç c = 0, 1, 2, 3, 4 ¤Î 5 Ä̤ꡣ
2 ·åÌÜ¡§0 <= b + b <= 9 ¤Ê¤Î¤Ç b = 0, 1, 2, 3, 4 ¤Î 5 Ä̤ꡣ
3 ·åÌÜ¡§0 <= a + a <= 9 ¤Ê¤Î¤Ç a = 0, 1, 2, 3, 4 ¤Î 5 Ä̤ꡣ
4 ·åÌÜ¡§1 + 1 = 2 ¤Ê¤Î¤Ç·«¤ê¾å¤¬¤ê¤Ï¤Ê¤¯ 1 Ä̤ꡣ
·ë¶É¡¤5 * 5 * 5 * 1 = 125 Ä̤ꡣ
(2) c = 9 ¤Î¾ì¹ç
A = 1ab9 = 1ab * 10 + 9¡¤B = A + 1 = 1ab9 + 1 = (1ab + 1) * 10 ¤Ë¤Ê¤ê¡¤A¡¤B ¤¬ 3 ·å¤Î¾ì¹ç¤Ëµ¢Ã夷¤Þ¤¹¡£
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b = 9 ¤Î¾ì¹ç¡¤1a9 = 1a * 10 + 9¡¤1a9 + 1 = (1a + 1) * 10 ¤Ë¤Ê¤ê¡¤A¡¤B ¤¬ 2 ·å¤Î¾ì¹ç¤Ëµ¢Ã夷¡¤
0 <= a <= 8 ¤Î¾ì¹ç¡¤5 * 1 = 5 Ä̤ꡣ
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3,4,9
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LET Kai=0
FOR A=1000 TO 1999
LET B=A+1
LET A1=MOD(A,10)
LET B1=MOD(B,10)
LET A10=MOD(INT(A/10),10)
LET B10=MOD(INT(B/10),10)
LET A100=MOD(INT(A/100),10)
LET B100=MOD(INT(B/100),10)
IF(A1+B1<10 AND A10+B10<10 AND A100+B100<10) THEN LET Kai=Kai+1
NEXT A
PRINT Kai
END
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