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November 17, 2025 21:22
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AOC 2019 / Day 5
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| package main | |
| func intcode(data []int, input int) (ans []int) { | |
| for i := 0; i < len(data); { | |
| opcode := data[i+0] | |
| if opcode == 99 { | |
| // exit | |
| return | |
| } | |
| a := data[i+1] | |
| b := data[i+2] | |
| // might not have a c? | |
| c := data[i : i+4][3] | |
| switch opcode { | |
| case 1: | |
| data[c] = data[a] + data[b] | |
| i += 4 | |
| case 2: | |
| data[c] = data[a] * data[b] | |
| i += 4 | |
| case 3: | |
| // give input | |
| data[a] = input | |
| i += 2 | |
| case 4: | |
| ans = append(ans, data[a]) | |
| i += 2 | |
| case 5: | |
| if data[a] != 0 { | |
| // jump if not 0 | |
| i = data[b] | |
| } else { | |
| i += 3 | |
| } | |
| case 6: | |
| if data[a] == 0 { | |
| i = data[b] | |
| } else { | |
| i += 3 | |
| } | |
| case 7: | |
| if data[a] < data[b] { | |
| data[c] = 1 | |
| } else { | |
| data[c] = 0 | |
| } | |
| i += 4 | |
| case 8: | |
| if data[a] == data[b] { | |
| data[c] = 1 | |
| } else { | |
| data[c] = 0 | |
| } | |
| i += 4 | |
| default: | |
| // parameter modes | |
| oc := opcode % 10 | |
| opcode /= 100 | |
| amode := opcode % 10 | |
| opcode /= 10 | |
| bmode := opcode % 10 | |
| opcode /= 10 | |
| // cmode := opcode % 10 | |
| if amode == 0 { | |
| // a is a position | |
| a = data[a] | |
| } | |
| if bmode == 0 && len(data) > b { | |
| // position | |
| b = data[b] | |
| } | |
| switch oc { | |
| case 1: | |
| data[c] = a + b | |
| i += 4 | |
| case 2: | |
| data[c] = a * b | |
| i += 4 | |
| case 3: | |
| // give input | |
| data[a] = input | |
| i += 2 | |
| case 4: | |
| ans = append(ans, a) | |
| i += 2 | |
| case 5: | |
| if a != 0 { | |
| // jump if not 0 | |
| i = b | |
| } else { | |
| i += 3 | |
| } | |
| case 6: | |
| if a == 0 { | |
| i = b | |
| } else { | |
| i += 3 | |
| } | |
| case 7: | |
| if a < b { | |
| data[c] = 1 | |
| } else { | |
| data[c] = 0 | |
| } | |
| i += 4 | |
| case 8: | |
| if a == b { | |
| data[c] = 1 | |
| } else { | |
| data[c] = 0 | |
| } | |
| i += 4 | |
| } | |
| } | |
| } | |
| return | |
| } |
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