STATISTICS ---------- For the past six IOIs, we list the lowest score to obtain a bronze, silver, and gold medal (the bronze cutoff is approximately the median score). The maximum score for all tasks together is 600 (this excludes any non-task-related bonuses). IOI 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 --- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- Lowest bronze medalist score 135 149 143 135 173.1 265 275 219 187 127 Lowest silver medalist score 234 310 266 226 257.7 365 393 314 286 229 Lowest gold medalist score 340 450 378 296 350.9 445 496 385 388 356 Top score 480 600 580 510 455.4 565 600 480 574 558 If available, we also list for each task the number and percentage of contestants that scored 90% or more on that task. The threshold of 90% allows for a contestant to fail on 1 test case in 10 and still be counted as having "fully solved" the task, that is, solved it __modulo a small mistake__. The classification as Easy, Medium, Hard is based on the following thresholds (which first appeared in the IOI 2002 competition survey): EASY : > 40% of the contestants "fully solved" the task MEDIUM: >= 10% and <= 40% of the contestants "fully solved" the task HARD : < 10% of the contestants "fully solved" the task IOI '95 '96 '00 '01 '02 '03 '04 '05 '06 '07 '08 --- --- --- --- --- --- --- --- --- --- --- --- number of EASY tasks 1 2 0 0 0 0 0 1 1 1 1 number of MEDIUM tasks 5 3 5 3 1 1 4 4 2 0 1 number of HARD tasks 0 1 1 3 5 5 2 1 3 5 4 DETAILS (only for IOIs where score per task per contestant is available) IOI 1989 with 46 ranked contestants (incl. second host team) |---boxes---| >=90%| 8 (17%) | | MEDIUM | IOI 1990 with 94 ranked contestants |---books---|---robot---| >=90%| 0 ( 0%) | 4 ( 4%) | | HARD | HARD | IOI 1991 with 68 ranked contestants |--square---|--s-terms--| >=90%| 42 (62%) | 3 ( 4%) | | EASY | HARD | IOI 1995 with 210 ranked contestants |---pack ---|---shop ---|---print---|---lgame---|---race ---|---wires--- >=90%| 110 (39%) | 99 (35%) | 79 (28%) | 122 (43%) | 110 (39%) | 87 (31%) | MEDIUM | MEDIUM | MEDIUM | EASY | MEDIUM | MEDIUM IOI 1996 with 216 ranked contestants |---game ---|--- jobs---|-- net ---|---magic---|--prefix---|---sort3--- >=90%| 91 (42%) | 16 ( 7%) | 36 (17%) | 69 (32%) | 69 (32%) | 112 (52%) | EASY | HARD | MEDIUM | MEDIUM | MEDIUM | EASY IOI 2000 with 270 ranked contestants |---palin---|--- car ---|--median---|---post ---|---walls---|---block--- >=90%| 80 (30%) | 31 (11%) | 27 (10%) | 56 (21%) | 79 (29%) | 11 (4%) | MEDIUM | MEDIUM | HARD | MEDIUM | MEDIUM | HARD IOI 2001 with 267 ranked contestants |--twofive--|--mobiles--|--ioiwari--|---depot---|---score---|---double-- >=90%| 1 (0%) | 3 (1%) | 79 (30%) | 18 (7%) | 39 (15%) | 54 (20%) | HARD | HARD | MEDIUM | HARD | MEDIUM | MEDIUM IOI 2002 with 275 ranked contestants Unable to obtain score per task per contestant; the following approximations are inferred from diagrams in the IOI 2004 competition report (pp. 49, 81) |---frog ---|--utopia---|--- xor ---|---batch---|--- bus ---|---rods --- >=90%| 45 (16%) | 8 (3%) | 2 (1%) | 12 (4%) | 9 (3%) | 20 (7%) | MEDIUM | HARD | HARD | HARD | HARD | HARD IOI 2003 with 265 ranked contestants |-maintain--|---code ---|--reverse--|---guess---|--robots---|-boundary-- >=90%| 81 (31%) | 4 (2%) | 0 (0%) | 14 (5%) | 11 (4%) | 12 (5%) | MEDIUM | HARD | HARD | HARD | HARD | HARD IOI 2004 with 295 ranked contestants |--artemis--|---hermes--|--polygon--|--empodia--|---farmer--|--phidias-- >=90%| 19 (6%) | 79 (27%) | 3 (1%) | 79 (27%) | 94 (32%) | 104 (35%) | HARD | MEDIUM | HARD | MEDIUM | MEDIUM | MEDIUM IOI 2005 with 276 ranked contestants |----gar----|----mea----|----mou----|----bir----|----rec----|----riv---- >=90%| 47 (17%) | 125 (45%) | 15 (5%) | 43 (16%) | 103 (37%) | 31 (11%) | MEDIUM | EASY | HARD | MEDIUM | MEDIUM | MEDIUM IOI 2006 with 284 ranked contestants |--writing--|--pyramid--|-forbidden-|---mexico--|---points--|--blackbox- >=90%| 203 (71%) | 47 (17%) | 7 (2%) | 81 (29%) | 1 (0%) | 3 (1%) | EASY | MEDIUM | HARD | MEDIUM | HARD | HARD IOI 2007 with 285 ranked contestants |---aliens--|---flood---|---sails---|---miners--|---pairs---|-trainings- >=90%| 67 (24%) | 24 (8%) | 12 (4%) | 141 (49%) | 12 (4%) | 3 (1%) | MEDIUM | HARD | HARD | EASY | HARD | HARD IOI 2008 with 283 ranked contestants |---type ---|--islands--|---fish ---|-teleport--|--linear---|--pyramid-- >=90%| 121 (43%) | 1 (0%) | 9 (3%) | 25 (9%) | 94 (33%) | 0 (0%) | EASY | HARD | HARD | HARD | MEDIUM | HARD MEDAL DISTRIBUTION Award versus number of tasks "fully solved". IOI 1995 --- ---- Nr. of tasks "fully solved" (k) --> Award | 0 1 2 3 4 5 6 Tot v Gold 0 0 8 (40%) 8 (40%) 3 (15%) 1 (5%) 0 20 Silver 4 (11%) 13 (36%) 16 (44%) 3 ( 8%) 0 0 0 36 Bronze 20 (37%) 27 (50%) 7 (13%) 0 0 0 0 54 None 90 (90%) 9 ( 9%) 1 ( 1%) 0 0 0 0 100 Total 114 (54%) 49 (23%) 32 (15%) 11 ( 5%) 3 ( 1%) 1 (0%) 0 210 IOI 1996 --- ---- Nr. of tasks "fully solved" (k) --> Award | 0 1 2 3 4 5 6 Tot v Gold 0 0 0 0 8 (40%) 11 (55%) 1 (5%) 20 Silver 0 0 2 ( 6%) 18 (50%) 15 (42%) 1 ( 3%) 0 36 Bronze 3 ( 6%) 7 (13%) 24 (46%) 13 (25%) 5 (10%) 0 0 52 None 55 (51%) 43 (40%) 10 ( 9%) 0 0 0 0 108 Total 58 (27%) 60 (23%) 36 (17%) 31 (17%) 28 (13%) 12 ( 6%) 1 (0%) 216 IOI 2000 --- ---- Nr. of tasks "fully solved" (k) --> Award | 0 1 2 3 4 5 6 Tot v Gold 0 0 0 3 (13%) 6 (26%) 9 (39%) 5 (22%) 23 Silver 0 5 (11%) 24 (51%) 14 (30%) 4 ( 9%) 0 0 47 Bronze 20 (29%) 39 (56%) 11 (16%) 0 0 0 0 70 None 126 (97%) 4 ( 3%) 0 0 0 0 0 130 Total 146 (54%) 48 (18%) 35 (13%) 17 ( 6%) 10 ( 4%) 9 ( 3%) 5 ( 2%) 270 This does not look so bad. Somewhat unfortunate high counts: * 5 silver medalists who "fully solved" only 1 task. * 20 bronze medalists who did not "fully solve" a single task. Noteworthy: * the top 5 places are for contestants who "fully solved" all tasks! (there still is a clear winner, even though that is not what the IOI is about) * there is no overlap in number of tasks "fully solved" between bronze medalists and gold medalists. * 4 non-medalists "fully solved" 1 task; none "fully solved" more than 1. IOI 2001 --- ---- Nr. of tasks "fully solved" (k) --> Award | 0 1 2 3 4 5 6 Tot v Gold 0 1 ( 4%) 4 (17%) 8 (35%) 9 (39%) 1 ( 4%) 0 23 Silver 0 19 (42%) 23 (51%) 3 ( 7%) 0 0 0 45 Bronze 31 (46%) 32 (47%) 5 ( 7%) 0 0 0 0 68 None 127 (97%) 4 ( 3%) 0 0 0 0 0 131 Total 158 (59%) 56 (21%) 32 (12%) 11 ( 4%) 9 ( 3%) 1 ( 0%) 0 267 Unfortunate high counts: * 1 gold medalist who "fully solved" only a single task; and 4 did only 2. * 19 silver medalists who "fully solved" only 1 task. * 31 bronze medalists who "fully solved" not a single task. Noteworthy: * The top scoring student (580 points) "fully solved" 5 of the 6 tasks. * 4 Non-medalists fully solve 1 task; none "fully solved" more than 1 IOI 2003 --- ---- Nr. of tasks "fully solved" (k) --> Award | 0 1 2 3 4 5 6 Tot v Gold 0 8 (33%) 12 (50%) 3 (12%) 1 ( 4%) 0 0 24 Silver 12 (27%) 25 (56%) 8 (18%) 0 0 0 0 45 Bronze 35 (56%) 27 (43%) 1 ( 2%) 0 0 0 0 63 None 126 (95%) 7 ( 5%) 0 0 0 0 0 133 Total 173 (65%) 67 (25%) 21 ( 8%) 3 ( 1%) 1 ( 0%) 0 0 265 Unfortunate low counts: * No contestants "fully solved" 5 or 6 tasks. * Only one (gold) contestants "fully solved" 4 tasks (this is not the contestant who got first place, but who ended on rank 5!). * Only three (gold) contestants "fully solved" 3 tasks. Unfortunate high counts: * 8 gold medalists "fully solved" only 1 task. * 25 silver medalists "fully solved" only 1 task, and 12 not a single task. * 35 bronze medalists "fully solved" not a single task. Noteworthy: * 7 non-medalists "fully solved" 1 task; none more than 1. IOI 2004 --- ---- Nr. of tasks "fully solved" (k) --> Award | 0 1 2 3 4 5 6 Tot v Gold 0 0 0 8 (31%) 13 (50%) 5 (19%) 0 26 Silver 0 5 (10%) 16 (33%) 24 (49%) 4 ( 8%) 0 0 49 Bronze 8 (11%) 27 (38%) 28 (39%) 8 (11%) 0 0 0 71 None 107 (72%) 39 (26%) 3 ( 2%) 0 0 0 0 149 Total 115 (39%) 71 (24%) 47 (16%) 40 (14%) 17 ( 6%) 5 ( 2%) 0 295 Unfortunate high counts: * 5 silver medalists who "fully solved" only 1 task. * 8 bronze medalists who did not "fully solve" a single task. * 8 bronze and 8 gold medalists "fully solved" three tasks. Noteworthy: * no contestant "fully solved" all tasks * the top 5 places are for contestants who "fully solved" five tasks. * 39 non-medalists "fully solved" 1 task; 3 even "fully solved" 2 tasks. IOI 2005 --- ---- Nr. of tasks "fully solved" (k) --> Award | 0 1 2 3 4 5 6 Tot v Gold 0 0 0 1 ( 4%) 10 (42%) 9 (38%) 4 (17%) 24 Silver 0 2 ( 4%) 14 (30%) 23 (49%) 8 (17%) 0 0 47 Bronze 10 (15%) 34 (51%) 20 (30%) 3 ( 4%) 0 0 0 67 None 102 (74%) 34 (25%) 2 ( 1%) 0 0 0 0 138 Total 112 (41%) 70 (25%) 36 (13%) 27 (10%) 18 ( 7%) 9 ( 3%) 4 ( 1%) 276 Unfortunate high counts: * 2 silver medalists who "fully solved" only 1 task. * 10 bronze medalists who did not "fully solve" a single task. * 3 bronze and 1 gold medalists "fully solved" three tasks. Noteworthy: * 34 non-medalists "fully solved" 1 task; 2 even "fully solved" 2 tasks. IOI 2006 --- ---- Nr. of tasks "fully solved" (k) --> Award | 0 1 2 3 4 5 6 Tot v Gold 0 0 7 (29%) 13 (54%) 4 (17%) 0 0 24 Silver 0 5 (10%) 39 (76%) 7 (14%) 0 0 0 51 Bronze 1 ( 1%) 34 (49%) 35 (50%) 0 0 0 0 70 None 74 (53%) 65 (47%) 0 0 0 0 0 139 Total 75 (26%) 104 (37%) 81 (29%) 20 ( 7%) 4 ( 1%) 0 0 284 Unfortunate high counts: * 7 gold medalists who "fully solved" only 2 tasks. * 5 silver medalists who "fully solved" only 1 task. * 1 bronze medalists who did not "fully solve" a single task. Noteworthy: * No contestants "fully solved" 5 or 6 tasks * 65 non-medalists "fully solved" 1 task IOI 2007 --- ---- Nr. of tasks "fully solved" (k) --> Award | 0 1 2 3 4 5 6 Tot v Gold 0 1 ( 4%) 4 (16%) 8 (32%) 9 (36%) 3 (12%) 0 25 Silver 1 ( 2%) 18 (38%) 24 (50%) 5 (10%) 0 0 0 48 Bronze 12 (17%) 44 (64%) 13 (19%) 0 0 0 0 69 None 119 (83%) 24 (17%) 0 0 0 0 0 143 Total 132 (46%) 87 (31%) 41 (14%) 13 ( 5%) 9 ( 3%) 3 ( 1%) 0 285 Unfortunate high counts: * 1 gold medalists who "fully solved" only 1 task, and 4 only 2. * 1 silver medalists who "fully solved" 0 tasks, and 18 only 1 task. * 12 bronze medalists who did not "fully solve" a single task. Noteworthy: * No contestants "fully solved" 6 tasks * 24 non-medalists "fully solved" 1 task IOI 2008 --- ---- Nr. of tasks "fully solved" (k) --> Award | 0 1 2 3 4 5 6 Tot v Gold 0 0 2 ( 8%) 17 (71%) 5 (21%) 0 0 24 Silver 1 ( 2%) 13 (28%) 31 (66%) 2 ( 4%) 0 0 0 47 Bronze 4 ( 6%) 50 (71%) 16 (23%) 0 0 0 0 70 None 130 (92%) 12 ( 8%) 0 0 0 0 0 142 Total 135 (48%) 75 (27%) 49 (17%) 19 ( 7%) 5 ( 2%) 0 0 283 Unfortunate high counts: * 2 gold medalists who "fully solved" only 2 tasks. * 1 silver medalists who "fully solved" 0 tasks, and 13 only 1 task. * 4 bronze medalists who did not "fully solve" a single task. Noteworthy: * No contestants "fully solved" 5 or 6 tasks * 12 non-medalists "fully solved" 1 task * Non contestant "fully solved" task Pyramid Base END OF STATISTICS