Submission #577157

#TimeUsernameProblemLanguageResultExecution timeMemory
577157berrXORanges (eJOI19_xoranges)C++17
0 / 100
151 ms6028 KiB
#include <bits/stdc++.h> using namespace std; int st1[400005], st2[400005], t1[200005], t2[200005]; void build1(int l, int r, int v) { if(l>r) return; else if(l==r) st1[v]=t1[l]; else { int mid=(l+r)/2; build1(l, mid, v*2); build1(mid+1, r, v*2+1); st1[v]=(st1[v*2] xor st1[v*2+1]); } } void build2(int l, int r, int v) { if(l>r) return; else if(l==r) st2[v]=t2[l]; else { int mid=(l+r)/2; build2(l, mid, v*2); build2(mid+1, r, v*2+1); st2[v]=(st2[v*2] xor st2[v*2+1]); } } void update1(int l, int r, int v, int pos, int val) { if(l>r) return; else if(l==r) t1[l]=st1[v]=val; else { if((l+r)/2>=pos) update1(l, (l+r)/2, v*2, pos, val); else update1((l+r)/2+1, r, v*2+1, pos, val); st1[v]=(st1[v*2] xor st1[v*2+1]); } } void update2(int l, int r, int v, int pos, int val) { if(l>r) return; else if(l==r) t2[l]=st2[v]=val; else { if((l+r)/2>=pos) update2(l, (l+r)/2, v*2, pos, val); else update2((l+r)/2+1, r, v*2+1, pos, val); st2[v]=st2[v*2] xor st2[v*2+1]; } } int get1(int l, int r, int tl, int tr, int v) { if(l>tr||r<tl){ return 0;} if(tl<=l&&tr>=r){return st1[v];} return (get1(l, (l+r)/2, tl, tr, v*2) xor (get1((l+r)/2+1, r, tl, tr, v*2+1))); } int get2(int l, int r, int tl, int tr, int v) { if(l>tr||r<tl) return 0; if(tl<=l&&r<=tr) return st2[v]; return (get2(l, (l+r)/2, tl, tr, v*2) xor (get2((l+r)/2+1, r, tl, tr, v*2+1))); } int main() { ios_base::sync_with_stdio(false); cin.tie(0); int n, q; cin>>n>>q; int l=0, r=0; vector<int> a(n); for(int i=0; i<n; i++) { if(i%2==0) cin>>t1[l], l++, a[i]=t1[l-1]; else cin>>t2[r], r++, a[i]=t2[r-1]; } build1(0, l-1, 1); build2(0, r-1, 1); while(q--) { int x, y, z; cin>>x>>y>>z; y--; if(x==1) { a[y]=z; if(y%2==0) update1(0, l-1, 1, y/2, z); else{update2(0, r-1, 1, y/2, z);} } else { z--; if(z-y==1) cout<<0; else if((z-y+1)%2==1) { if(y%2==0) { cout<<get1(0, l-1, y/2, z/2, 1); } else { cout<<get2(0, r-1, y/2, z/2, 1); } } else { if((y+1)%2==1) { cout<<get1(0, l-1, (y)/2, (z/2), 1); } else { cout<<get2(0, l-1, (y)/2, (z/2), 1); } } cout<<"\n"; /* cout<<" "; int h=0; for(int l=1; l<=(z-y)+1; l++){ for(int j=y; j+l-1<=z; j++){ for(int i=j; i<=j+l-1; i++){ h=(h xor a[i]);} }} cout<<h<<"\n"; -*/ } } }
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