138 lines
2.9 KiB
Zig
138 lines
2.9 KiB
Zig
const std = @import("std");
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const print = std.debug.print;
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const expect = std.testing.expect;
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test "simple partition #1" {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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const allocator = gpa.allocator();
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defer {
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_ = gpa.deinit();
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}
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const arr = try allocator.alloc(u64, 3);
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arr[0] = 1;
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arr[1] = 3;
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arr[2] = 5;
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defer {
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allocator.free(arr);
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}
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const res = bipartition(arr, 0, @as(u64, arr.len - 1), 2);
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// std.log.warn("Res {}", .{res});
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try expect(res == 1);
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}
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test "simple partition #2" {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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const allocator = gpa.allocator();
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defer {
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_ = gpa.deinit();
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}
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const arr = try allocator.alloc(u64, 4);
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arr[0] = 1;
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arr[1] = 3;
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arr[2] = 5;
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arr[3] = 6;
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defer {
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allocator.free(arr);
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}
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const res = bipartition(arr, 0, @as(u64, arr.len - 1), 4);
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// std.log.warn("Res {}", .{res});
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try expect(res == 2);
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}
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test "simple partition #3" {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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const allocator = gpa.allocator();
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defer {
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_ = gpa.deinit();
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}
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const arr = try allocator.alloc(u64, 4);
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arr[0] = 1;
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arr[1] = 3;
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arr[2] = 5;
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arr[3] = 6;
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defer {
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allocator.free(arr);
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}
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const res = bipartition(arr, 0, @as(u64, arr.len - 1), 0);
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// std.log.warn("Res {}", .{res});
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try expect(res == 0);
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}
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test "simple partition #4" {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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const allocator = gpa.allocator();
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defer {
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_ = gpa.deinit();
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}
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const arr = try allocator.alloc(u64, 4);
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arr[0] = 1;
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arr[1] = 3;
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arr[2] = 5;
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arr[3] = 6;
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defer {
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allocator.free(arr);
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}
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const res = bipartition(arr, 0, @as(u64, arr.len - 1), 7);
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// std.log.warn("Res {}", .{res});
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try expect(res == 4);
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}
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test "simple partition #5" {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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const allocator = gpa.allocator();
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defer {
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_ = gpa.deinit();
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}
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const arr = try allocator.alloc(u64, 4);
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arr[0] = 1;
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arr[1] = 3;
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arr[2] = 5;
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arr[3] = 6;
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defer {
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allocator.free(arr);
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}
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const res = bipartition(arr, 0, @as(u64, arr.len - 1), 6);
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// std.log.warn("Res {}", .{res});
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try expect(res == 3);
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}
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pub fn bipartition(arr: []u64, t1: u64, t2: u64, v: u64) u64 {
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// std.log.warn("Arr called with {}, {}, {}", .{ t1, t2, v });
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var x1: u64 = t1;
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var x2: u64 = t2;
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var x: u64 = undefined;
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if (arr.len <= 0) {
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return x1;
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}
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if (v < arr[x1]) {
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return x1;
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}
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if (v > arr[t2]) {
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return t2 + 1;
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}
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while (x1 < x2 - 1) {
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// std.log.warn("Round {},{}", .{ t1, t2 });
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x = (x1 + x2) / 2;
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if (arr[x] < v) {
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x1 = x;
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} else {
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x2 = x;
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}
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}
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return x2;
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}
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pub fn main() !void {
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print("Hello World {}!!!\n", .{1});
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}
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