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MSDN
1+3+5+...+(2n-1)=n*n
Rank by solved
555 out of 140249
Problems solved
346 out of 1148
Rank by rating
511 out of 140249
Rating
134378 out of 1581367
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1124
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2108
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1145
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1155
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1410
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1111
1854
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1252
1291
1077
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2109
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1437
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1254
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1379
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1456
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2089
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1629
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1147
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1105
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1875
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1580
1422
1165
1805
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1530
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2140
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1339
1418
1926
1575
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1861
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1245
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1130
1965
1175
1233
1237
1324
1817
1570
1863
1630
1364
1435
1715
1040
1560
1824
1974
2037
1608
1278
1927
1986
1625
1988
1451
1331
1569
1679
1905
1461
1761
1591
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1996
1434
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1936
1699
1836
2103
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1533
1827
1469
1518
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1730
1539
1472
1317
1883
1540
1937
1948
1768
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1341
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1862
2017
1595
1979
1736
1310
1037
1099
1907
1386
1393
2126
1750
1552
1408
1441
1855
1687
1857
1511
1357
2093
2059
1544
1527
1458
1453
1467
1790
1359
1949
2124
2134
1666
1722
1538
2052
1487
1584
1747
1307
1791
1879
1669
2120
1171
1419
1177
1766
1811
1035
2055
2036
1321
1360
1807
1526
1097
1050
1531
1065
1328
2107
1476
1347
1686
1240
1719
1281
1983
1345
1318
1968
1673
1844
1657
1311
1499
1449
1266
2101
1813
1620
1170
1299
1378
2147
1947
1265
2085
1412
2058
1746
1488
1387
1762
1851
1337
1677
1043
2007
1568
1913
1946
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1951
1485
1251
1241
2132
1285
1764
1565
1257
1420
1676
1459
1508
1675
1808
2136
1557
1425
1338
1148
1397
1670
1894
1382
1908
1062
1950
1703
1046
1503
1583
1144
1516
1707
1919
1514
1886
2097
1667
1782
1610
1802
1818
1417
1664
1615
1163
1304
1093
1655
1267
1749
2041
1315
1744
1781
1492
1522
1455
1532
1187
1396
2133
1734
1075
1739
1216
1074
1702
1831
1841
1041
1188
1541
1231
1757
1063
1634
2044
1956
2083
1895
1092
1288
1953
1849
2118
1543
1361
1256
1852
2038
1549
1867
1816
1284
1839
1232
1504
1977
2125
1481
1969
1270
1717
1368
1833
2050
1454
1520
1652
1597
1882
1850
1395
1812
1758
1429
1599
2075
1275
1978
1300
1609
1308
1561
1735
2049
1835
2096
1058
1663
1695
1945
2084
1714
1972
1694
1464
1312
1916
1955
1239
1566
2127
1829
1505
1704
1477
1814
2139
1865
2061
1438
1411
1367
1637
2122
1482
1442
2022
1466
1691
2053
2087
1622
1623
1958
2006
1681
1954
1751
2051
1856
2057
1381
1166
1199
1798
1843
2137
1509
1765
1810
1911
1616
1858
1478
2131
1975
2043
1778
1380
1559
1909
1632
1475
1859
1661
1815
1529
1845
1460
1914
1799
1834
2079
1847
1344
1733
1598
1938
2090
1271
1662
1621
2086
1594
1897
1957
1340
1365
1967
2042
1763
1384
1797
1426
1473
1973
1618
1801
2088
1391
1697
1479
2094
1848
2077
1771
2039
1363
1372
1999
1674
1842
1660
1668
1819
2082
1624
2076
2054
1906
1653
2016
1536
1853
1649
1626
1432
1840
1596
1678
1556
1415
1376
1390
1399
1693
1952
1672
1555
1374
1708
1524
1369
1383
1388
1548
1394
1589
Neighbours
Rank
Author
Rating
Solved
Last AC
552
Yuriy Nazarov [Samara SAU]
81190
347
3 Sep 2020 21:09
553
taobingxue
220146
346
10 Jul 2014 23:56
554
fangge518
215784
346
15 Nov 2012 16:48
555
MSDN
134378
346
18 Nov 2010 15:21
556
airibo
108134
346
10 Aug 2016 04:53
557
Soporboy Botirov
101957
346
25 Oct 2015 00:05
558
igormsu
93383
346
6 Jul 2019 22:46
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