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Problem ID Title Source AC Submit DIFFICULTY
1901
1.4
1902
4.4
1903
7.9
1904
4.4
1905
2.7
1906
4.2
1907
0.6
1908
4.7
1909
6.6
1910
2.7
1911
4.8
1912
4.3
1913
2.0
1914
7.9
1915
0.8
1916
7.2
1917
6.8
1918
6.7
1919
0.7
1920
2.6
1921
4.7
1922
4.8
1923
1.7
1924
4.4
1925
4.6
1926
4.2
1927
4.4
1928
4.7
1929
4.8
1930
6.1
1931
7.5
1932
2.5
1933
6.1
1934
6.5
1935
6.7
1936
4.4
1937
3.1
1938
2.6
1939
3.6
1940
3.6
1941
6.8
1942
CXF
2.3
1943
0.6
1944
1.0
1945
0.8
1946
1.4
1947
2.5
1948
0.8
1949
2.5
1950
2.0
1951
2.5
1952
0.8
1953
2.0
1954
2.0
1955
2.8
1956
0.8
1957
6.4
1958
5.5
1959
4.8
1960
6.5
1961
3.9
1962
5.4
1963
1.4
1964
2.0
1965
2.3
1966
3.6
1967
2.9
1968
edit by
2.0
1969
3.1
1970
3.6
1971
3.5
1972
2.9
1973
6.6
1974
3.5
1975
2.6
1976
2.6
1977
2.3
1978
4.6
1979
2.9
1980
NOI’2005
6.5
1981
3.8
1982
3.6
1983
2.3
1984
ZJGSU
3.1
1985
ZJGSU
2.0
1986
ZJGSU
6.0
1987
ZJGSU
2.3
1988
ZJGSU
1.7
1989
2.8
1990
0.8
1991
4.0
1992
0.8
1993
2.0
1994
2.6
1995
2.5
1996
4.2
1997
4.4
1998
2.5
1999
4.0