Submission #795820

#	Time	Username	Problem	Language	Result	Execution time	Memory
795820		Godgift42	XORanges (eJOI19_xoranges)	C++14	100 / 100	132 ms	10436 KiB

xoranges

#include <bits/stdc++.h>
using namespace std;

vector<int> st;
vector<int> st2;

void build(vector<int>& a, int v, int tl, int tr){
    if(tl==tr) st[v]=a[tl];
    else{
        int tm=(tl+tr)/2;
        build(a,v*2,tl,tm);
        build(a,v*2+1,tm+1,tr);
        st[v]=st[v*2]^st[v*2+1];
    }
}

int XUM(int v, int tl, int tr, int l, int r){
    if(l>r) return 0;
    if(l==tl and r==tr) return st[v];
    int tm=(tl+tr)/2;
    return XUM(v*2,tl,tm,l,min(r,tm))^XUM(v*2+1,tm+1,tr,max(l,tm+1),r);
}

void update(int v, int tl, int tr, int pos, int new_val){
    if(tl==tr){
        st[v]=new_val;
    }
    else{
        int tm=(tl+tr)/2;
        if(pos<=tm) update(v*2,tl,tm,pos,new_val);
        else update(v*2+1,tm+1,tr,pos,new_val);
        st[v]=st[v*2]^st[v*2+1];
    }
}

void build2(vector<int>& a, int v, int tl, int tr){
    if(tl==tr) st2[v]=a[tl];
    else{
        int tm=(tl+tr)/2;
        build2(a,v*2,tl,tm);
        build2(a,v*2+1,tm+1,tr);
        st2[v]=st2[v*2]^st2[v*2+1];
    }
}

int XUM2(int v, int tl, int tr, int l, int r){
    if(l>r) return 0;
    if(l==tl and r==tr) return st2[v];
    int tm=(tl+tr)/2;
    return XUM2(v*2,tl,tm,l,min(r,tm))^XUM2(v*2+1,tm+1,tr,max(l,tm+1),r);
}

void update2(int v, int tl, int tr, int pos, int new_val){
    if(tl==tr){
        st2[v]=new_val;
    }
    else{
        int tm=(tl+tr)/2;
        if(pos<=tm) update2(v*2,tl,tm,pos,new_val);
        else update2(v*2+1,tm+1,tr,pos,new_val);
        st2[v]=st2[v*2]^st2[v*2+1];
    }
}

int main(){
    int n,q;
    scanf("%d%d",&n,&q);
    vector<int> a;
    vector<int> a2;
    st.resize(4*((n+1)/2));
    st2.resize(4*(n/2));
    for(int i=0;i<n;i++){
        int x;
        scanf("%d",&x);
        if((i&1)==0)a.push_back(x);
        else a2.push_back(x);
    }
    build(a,1,0,((n+1)/2)-1);
    build2(a2,1,0,n/2-1);
    while(q--){
        int action;
        scanf("%lld",&action);
        if(action==1){
            int pos,ch;
            scanf("%d%d",&pos,&ch);
            if((pos&1)!=0) update(1,0,(n+1)/2-1,pos/2,ch);
            else update2(1,0,n/2-1,pos/2-1,ch);
        }
        else{
            int l,u;
            scanf("%d%d",&l,&u);
            if(((u-l)&1)==1) printf("%d\n",0);
            else{
                if((l&1)==1){
                    int xum=XUM(1,0,((n+1)/2)-1,l/2,u/2);
                    printf("%d\n",xum);
                }
                else{
                    int xum=XUM2(1,0,(n/2)-1,l/2-1,u/2-1);
                    printf("%d\n",xum);
                }
            }
        }
    }
    return 0;
}

Compilation message (stderr)

xoranges.cpp: In function 'int main()':
xoranges.cpp:82:19: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'int*' [-Wformat=]
   82 |         scanf("%lld",&action);
      |                ~~~^  ~~~~~~~
      |                   |  |
      |                   |  int*
      |                   long long int*
      |                %d
xoranges.cpp:67:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |     scanf("%d%d",&n,&q);
      |     ~~~~~^~~~~~~~~~~~~~
xoranges.cpp:74:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |         scanf("%d",&x);
      |         ~~~~~^~~~~~~~~
xoranges.cpp:82:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         scanf("%lld",&action);
      |         ~~~~~^~~~~~~~~~~~~~~~
xoranges.cpp:85:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |             scanf("%d%d",&pos,&ch);
      |             ~~~~~^~~~~~~~~~~~~~~~~
xoranges.cpp:91:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |             scanf("%d%d",&l,&u);
      |             ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 25 / 25
• Subtask 4: 20 / 20
• Subtask 5: 25 / 25