const print = std.debug.print;
const std = @import("std");

const input = @embedFile("input");

inline fn get(x: i8, y: i8) u8 {
    return switch (x) {
        0...99 => switch (y) {
            0...99 => input[@intCast(usize, x) + @intCast(usize, y) * 101],
            else => ':',
        },
        else => ':',
    };
}

pub fn main() void {
    var sum: usize = 0;
    defer print("{}\n", .{ sum });

    var row: i8 = 0;
    while (row < 100) : (row += 1) {
        var col: i8 = 0;
        while (col < 100) : (col += 1) {
            const height = get(col, row);
            sum += @boolToInt(@reduce(.And, @Vector(4, u8){
                get(col + 1, row),
                get(col, row + 1),
                get(col - 1, row),
                get(col, row - 1),
            } > @splat(4, height))) * (height - '/');
        }
    }
}