day 15

day15/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day15"
+version = "0.1.0"

day15/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day15"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day15/input.txt

@@ -0,0 +1 @@
+rr=8,dd-,qck-,hkk=8,xfmqn=4,sx-,mgm=4,rkbh=8,scdp-,jllv=6,vgv-,bth=3,mmx-,vjbx-,jllv-,mnp-,mtcd-,zdxdbr=8,hjxk-,hcj=4,cbss=7,gds=3,lsk-,tc=1,hfjd-,gz-,bjbjs-,zx-,ldd-,kvp-,jllv-,xhmg=5,nzjmq-,xml=1,dz=1,mpl=6,zkp=5,ksl-,jsb=5,pb-,ffk=6,lsx-,hpb=6,gpkm-,dd-,sqn=9,jsb=8,hvghn-,hfjd=7,mtcd-,dq-,cmfkv-,vmch-,bp-,ftfh-,qck=8,dxxp=4,pkhcz=5,hb=5,ln=8,cpq-,nn-,mhr-,qfz=5,pp=8,lfst=9,tz-,rdr-,zlrz=1,lfcfh-,btnp=8,jgc=6,qrcl=9,hqcs-,bnf-,gsj=4,nmtpp-,hh=8,bq-,vzdt=3,hsr=9,jrj-,sbpc=6,ph=4,znqb=5,mfdc-,cpk=3,srkt-,kb-,sbs-,jfs=8,pf-,xsrqvg-,tkf-,pmb-,vzgr-,zjdzq-,tzn=4,lt=6,fsx=1,bfk=5,hfjd-,zpv-,xldjdr-,vmlz-,gn-,bc=7,mpdgm=9,mnl=1,hn=3,bvd-,cp-,ktl=7,xlp-,gj-,snzvpk=5,sp=4,jbf=6,pxs=7,dsxs=4,tc-,vb-,rpfx=5,rkvv=4,kkmdd-,dd=4,hqsd-,hst=1,kqjzrb=6,njf-,sbpc=8,lsx-,mmx=9,xlp=2,qx=6,jq=9,pb-,ds=5,dk=2,vlv=4,njf=7,lvjhdd=3,bxh=6,bvd=1,kcxfg-,ftf-,gql=8,mpl=1,qr=5,ghg-,kn=7,vcrpbh-,zpv=2,rbkzjv=6,jllv-,ldc=3,blm-,qr=5,mnl=2,cmx-,ccmftg=6,dsxs=8,ndvqm=6,tc=8,csdjh=4,gn-,zdr-,fp=3,qmj=4,fh=9,lvrrk=1,tnt=1,cthbt=3,dxz=3,bvd-,tj=9,rx-,ls=1,ttd-,fg=1,ls-,cpk-,jlt-,nt=8,jnkh-,ccmftg=5,nn=3,dtlc-,bdzht=7,zpdbq=3,hqcs=4,fg=3,kqjzrb=4,ghdft=7,vzdt-,vxr-,pb-,hsr-,kpg-,bfk-,snzvpk-,cbt-,hjxk=3,hlprv=5,fsq-,mtvrb=2,mhr=1,xrpgk=7,jd=1,jt=4,tk=5,pmm=2,jsb=8,xldjdr-,znqb=2,dqdl-,sp-,mtcd-,sd-,jzg-,mpdgm-,grl-,ljfx-,mpl-,gj-,ckk-,ltkdp=4,qb=3,qhx=6,gds=1,bhfb=8,qhx=3,zx=7,dxxp=3,hctrqn-,ljfx=6,rpfx-,jmz=7,jsb=4,mvx=5,rf=9,nfxf-,fh=9,gn=8,fgdbf-,scdp-,cthbt=6,lcrqx-,tzn=3,jrj=4,gpx-,vhp=8,xcrjq=7,xrpgk=3,kvp=7,lp-,dqdl-,ksl-,bj-,chp=7,trj=7,xdz=1,sb=6,bnf-,xml-,ftl-,jszb=2,ls-,qt=9,xl-,xhmg=6,xxb-,vfprd-,kkmdd=7,lghn-,grl=2,tcm=9,nlb-,hlt=2,zdr-,tjlg-,jbf-,xl-,gf-,jhp-,htxs=3,dd-,rtz-,slp=8,vhp-,gn=6,pn=9,dnx-,lfcfh-,dm-,hqcs=8,bbf-,dz-,qglr=3,qcm=5,slg-,hkk-,qbz=2,zbk=4,pz=2,rbkzjv-,sgs=9,fthkvq=7,ftf=4,dq-,mmb-,mf=6,hctrqn=7,lhls-,zbrslm=6,kx=9,vxfgd=1,vgv=8,gpx=1,vh=4,bxh=3,cxkt-,qhb=8,gz-,ksd-,mhp=6,xq-,ksl=9,spc-,ttpk=6,ldd=7,rg=4,pm=9,bfk=4,zv=9,xsrqvg=9,qk=2,jrj=6,csdjh-,vbjch=1,dxz-,vmch=4,px-,jdvn=3,cp=9,lghn-,ttpk-,zbk=7,nqh=6,rkbh-,fgv=8,pvqk=8,jd=5,vmch=6,ln-,jmztc-,pmm-,qfz-,mhj-,rjtdf-,jv=2,jskgmj-,gt=1,jv-,pxj=8,hjs=9,gz=3,kh=2,nqq=7,dtj=8,fsq=8,qglr=3,vgv=3,tjlg=3,rdr=3,lx-,vhp-,jnkh-,pkx=2,chtcdj=9,ksl=2,bcb-,tnt-,gkf=7,kh-,nsp=3,pp-,mmx=7,mgv-,vzgr-,bnf-,tv=7,hctrqn-,xhmg-,hkk-,kkmdd=5,bhfb=3,btg-,bqch-,vbhvv=1,pz-,fbklmr=9,hkhs=5,lppmv=9,ltkdp=9,hlprv=9,ttp=6,gs=5,lm-,pz-,gn=6,qb-,vnv-,vhbf=8,gpl-,pmm-,rsn=2,gqlkm=5,lsk-,hst=7,hv-,pgdg-,hst-,csdjh-,fvp-,cxkt=8,gkf=1,kvx-,rjsb=9,pvqk=9,glp=2,ds-,vbhvv=4,xs-,fgdbf-,blm-,kdr=5,grh-,lfcfh=3,mb=9,jh=4,prs=7,gm=3,dz-,ftbdsn-,jd=2,kjgmr-,dxv=2,qmq-,dtlc-,ll=9,tjlg-,plj=8,ccg-,lt-,vq-,ft=6,lsx-,xcrjq-,rkvv=2,sph=7,vb-,lp=6,xnvm=4,ktd=5,txc=6,zbk=4,lxm=9,lq=6,mhr-,gql=9,gpkm=7,lsx-,fz-,bq-,hlt=3,trj=9,pkdd=9,xnvm=4,hv=5,lppmv-,dg-,vq-,rbkzjv-,srkt=3,cpk=6,vds-,xvm-,mpdgm=3,cc-,xml=3,hcj-,dxv=9,lvjhdd=2,mtx-,dz-,mdtzp-,gj-,zrvk-,gds-,kz-,tj=5,tkk=1,qx=9,tmn-,mnp-,ztz=7,qz=6,ndjn-,tcm=7,pgdg=2,ftfh=2,bfk-,nqq=9,zmft-,rvps-,gmvt=3,pkhcz-,qfz-,bth=8,xb=8,lt=2,zx-,mrs-,tgvkt=2,qt-,dqdl-,fsx=8,mnp=6,hpb=6,pgdg-,vmlz-,prmt=7,bqch=7,bxg-,mvbf=4,qm=7,xq=9,prmt=9,qb-,crhh-,ghv=8,nrk-,qhx-,qz=7,sgs-,lmdx-,sbpc=5,nmtpp=8,bdzht=4,blm=2,kz=9,vgv=5,hctrqn=2,nxc=6,pgdg-,pzllx=6,hx=8,slg-,nmtpp-,nt-,skb=6,mb=6,jk-,fd-,jvn=9,jh=2,lz-,vgf=6,nzjmq=5,kqjzrb-,sbpc=7,cm-,sbpc=8,xxb-,jh=4,jvh=5,hjxk=6,lkxmjz-,trj-,prs-,gn-,tj-,fvp=7,ztz-,vq=4,mdtzp=4,zbrslm=2,fz-,xsrqvg-,ktd=6,hl=5,nrk-,nnhv=3,gc=3,rtl=8,tn=6,tnt=9,jd-,gzt=3,bdzht-,tv-,tk=3,mls-,jnbfd=5,kz-,nzjmq=6,qrcl=4,mrsl=1,sbs=7,gqlkm=3,jsb-,mj=3,mrs-,fgdbf-,nv-,cm=1,zrvk-,njf=7,ljfx=1,zpdbq-,zc=6,zpdbq=6,kvp=5,zsd=9,hjs=7,njf=9,xq-,nrk-,lghn=3,rjtdf-,dqdl-,vlv=2,jrj-,nnhv-,vx-,ffn-,xp-,fsx=2,gc=4,qxmqls=8,mhxczx=7,bxh=6,kb-,dnx-,mxrf=6,btnp-,zpv-,mblp=9,kg=9,tv-,fsq=8,kkmdd-,bdzht-,pt=8,zhsns-,hst-,jskgmj-,chtcdj-,hx-,dtlc-,mfc=3,tkf-,pk-,bhfb-,fh=1,bgtj-,nnhv-,blm-,tmn=1,qhzq-,bdzht=2,cx-,mgv=6,sqn=9,qm-,rf=9,nrk-,fh-,trj-,ttd=5,kh=7,bjbjs=2,pmm-,dd-,ksd=7,cbt=9,ng-,xn=6,mq-,kb-,jskgmj=3,cx=8,rf=1,vbv=9,jfs=8,xl=4,xs=4,cpk-,jc=5,sgs-,tsp-,pn=5,pp-,mhj-,nlb-,qs-,xldjdr-,fgdbf-,vr-,md=7,gsj=7,hjxk=8,tnt-,fvp-,bc-,qb-,ksl-,fbklmr=3,cthbt-,vnv-,lsk-,plj-,hlprv=6,gqlkm-,xm-,ksd-,rx-,kmlszs=7,kkmdd-,vzdt-,ftbdsn-,xhmg=2,sp=2,ng=9,hp-,vgv-,mnp-,grl-,tnt=7,bxg=7,pb=6,sph-,pmm=4,rr=2,nn=7,spc=8,hkhs-,lmdx-,hfjd-,ccmftg-,snzvpk-,dg=2,qhzq-,cjhz=4,qjqhhf=6,hqcs-,spc=7,jnbfd=8,chtcdj=7,mmb-,qmj-,kzkn=4,lp-,nsp-,ffk=5,bv-,hlprv-,xdb=8,qbz=9,mx-,zjdzq-,jt=7,bnc-,ltkdp-,xs=6,qhzq-,cbss-,gn=8,hvghn=4,gf-,gzt=1,vp=3,mj=8,qz=9,xxb-,ftfh=1,kdr=9,hv=1,xb=7,vk=8,mnl=5,hx-,xs-,jk=2,cr=1,dsxs-,spc-,dxxp=7,gchjj-,xldjdr-,zkst-,ftl=7,rpfx-,pkx=3,js-,dj-,dtj=2,plj=7,vbhvv=2,hkk=8,gqlkm=9,gmvt-,bjbjs-,skb-,jskgmj-,vbjch-,jmz=3,nrk=8,nsp=4,mtvrb-,sd=8,ph=2,hpb=5,bgtj-,kn=6,ms-,mrq=1,xz=2,tk-,vhp-,ng=8,xdb=6,sbs=9,pzllx-,mrsl=4,hlt-,jvh=2,bnc-,mhxczx-,chp-,gpx-,fsx=1,cxkt=2,dsxs=4,tgvkt-,bnf=4,csdjh-,xmx-,zxn-,mnl=5,xlp=7,btnp-,sbs=5,zjdzq-,nqh-,kn=2,fp=7,btg-,zm=2,mvx-,Line truncated

day15/src/main.rs

@@ -0,0 +1,65 @@
+use std::fs::read_to_string;
+use std::time::Instant;
+
+fn get_hash(data: &[u8]) -> u8 {
+    let mut state: u16 = 0;
+    for &c in data {
+        state += c as u16;
+        state *= 17;
+        state &= 255;
+    }
+    state as u8
+}
+
+fn main() {
+    let time_start = Instant::now();
+    let input_str = read_to_string("input.txt").unwrap();
+    let input_line = input_str.lines().next().unwrap();
+    let time_start_no_io = Instant::now();
+    // Task 1
+    let mut sum1: u32 = 0;
+    // Task 2
+    let mut sum2: u32 = 0;
+    // Rust is annoying
+    const NEW_VEC: Vec<(&[u8], u8)> = vec![];
+    let mut boxes: [Vec<(&[u8], u8)>; 256] = [NEW_VEC; 256];
+    // Processing the input
+    for str in input_line.split(',') {
+        let bytes = str.as_bytes();
+        // Task 1
+        sum1 += get_hash(bytes) as u32;
+        // Task 2
+        if *bytes.last().unwrap() == b'-' {
+            // Remove
+            let label = &bytes[..bytes.len()-1];
+            let hash = get_hash(label);
+            let target_box = &mut boxes[hash as usize];
+            if let Some(index) = target_box.iter().position(|(str, _)| *str == label ) {
+                target_box.remove(index);
+            }
+        } else {
+            // Insert / modify
+            let focal = bytes.last().unwrap() - b'0';
+            let label = &bytes[..bytes.len()-2];
+            let hash = get_hash(label);
+            let target_box = &mut boxes[hash as usize];
+            if let Some(index) = target_box.iter().position(|(str, _)| *str == label ) {
+                target_box[index] = (label, focal);
+            } else {
+                target_box.push((label, focal));
+            }
+        }
+    }
+    for (i, current_box) in boxes.iter().enumerate() {
+        let box_value = i + 1;
+        for (i, (_, focal)) in current_box.iter().enumerate() {
+            sum2 += (box_value * (i + 1) * *focal as usize) as u32;
+        }
+    }
+    let elapsed = time_start.elapsed().as_micros();
+    let elapsed_no_io = time_start_no_io.elapsed().as_micros();
+    println!("Time: {}us", elapsed);
+    println!("Time without file i/o: {}us", elapsed_no_io);
+    println!("Sum1: {}", sum1);
+    println!("Sum2: {}", sum2);
+}