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Day 4.2

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Nick Thomas
2019-12-04 23:27:58 +00:00
parent a2607b8508
commit be0c611f0d
1 changed files with 34 additions and 22 deletions
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54
04/src/main.zig
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@@ -8,35 +8,47 @@ const last = 643603;
// - [x] Two adjacent digits are the same (like 22 in 122345). // - [x] Two adjacent digits are the same (like 22 in 122345).
// - [x] Going from left to right, the digits never decrease; they only ever increase or stay the same (like 111123 or 135679). // - [x] Going from left to right, the digits never decrease; they only ever increase or stay the same (like 111123 or 135679).
fn tests1(num: i32) anyerror!bool { fn tests1(num: i32, str: []u8) bool {
var buf: [6]u8 = undefined; if (str[0] > str[1] or str[1] > str[2] or
var numStr = try std.fmt.bufPrint(&buf, "{}", num); str[2] > str[3] or str[3] > str[4] or
str[4] > str[5]) return false;
if (numStr[0] > numStr[1] or return str[0] == str[1] or str[1] == str[2] or
numStr[1] > numStr[2] or str[2] == str[3] or str[3] == str[4] or
numStr[2] > numStr[3] or str[4] == str[5];
numStr[3] > numStr[4] or }
numStr[4] > numStr[5]
) return false;
return fn tests2(num: i32, str: []u8) bool {
numStr[0] == numStr[1] or if (str[0] == str[1] and str[1] != str[2]) return true; // [0 1]2 3 4 5
numStr[1] == numStr[2] or if (str[1] == str[2] and str[0] != str[1] and str[2] != str[3]) return true; // 0[1 2]3 4 5
numStr[2] == numStr[3] or if (str[2] == str[3] and str[1] != str[2] and str[3] != str[4]) return true; // 0 1[2 3]4 5
numStr[3] == numStr[4] or if (str[3] == str[4] and str[2] != str[3] and str[4] != str[5]) return true; // 0 1 2[3 4]5
numStr[4] == numStr[5]; if (str[4] == str[5] and str[3] != str[4]) return true; // 0 1 2 3[4 5]
return false;
} }
pub fn main() anyerror!void { pub fn main() anyerror!void {
var count: i32 = 0; var count1: i32 = 0;
var count2: i32 = 0;
var i: i32 = first; var i: i32 = first;
while (i <= last) : (i+=1) { while (i <= last) : (i += 1) {
if (try tests1(i)) { var buf: [6]u8 = undefined;
//std.debug.warn("Match: {}\n", i); var numStr = try std.fmt.bufPrint(&buf, "{}", i);
count+=1;
if (tests1(i, numStr)) {
count1 += 1;
if (tests2(i, numStr)) {
std.debug.warn("Match: {}\n", i);
count2 += 1;
}
} }
} }
std.debug.warn("Part 1: matches: {}\n", count); std.debug.warn(" 012345\n");
std.debug.warn("Part 1: matches: {}\n", count1);
std.debug.warn("Part 2: matches: {}\n", count2);
} }