Submission #13343

#	Time	Username	Problem	Language	Result	Execution time	Memory
13343		dohyun0324	XOR (IZhO12_xor)	C++14	Compilation error	0 ms	0 KiB

xor

#include<stdio.h>
#include<unordered_map>
#include<string.h>
using namespace std;
map<int,int>ch;
int ans,p,len,n,x,a[250010],b[250010],sum[250010],dap[250010],t,r;
int main()
{
    int i,j;
    scanf("%d %d",&n,&x);
    for(i=1;i<=n;i++) scanf("%d",&a[i]);
    for(i=30;i>=0;i--){
        r=1<<i; t+=r;
        if(x&r){
            for(j=1;j<=n;j++){
                if(r&a[j]) b[j]+=r;
                sum[j]=sum[j-1]^b[j];
            }
        }
        else{
            for(j=1;j<=n;j++){
                if(r&a[j]) b[j]+=r;
                sum[j]=sum[j-1]^b[j];
                ch[sum[j]]=j;
            }
            for(j=1;j<=n;j++) dap[j]=max(dap[j],ch[sum[j-1]^t]);
            for(j=1;j<=n;j++) ch[sum[j]]=0;
            t-=r;
        }
    }
    for(j=1;j<=n;j++) ch[sum[j]]=j;
    for(j=1;j<=n;j++) dap[j]=max(dap[j],ch[sum[j-1]^t]);
    for(i=1;i<=n;i++){
        if(ans<dap[i]-i+1) ans=dap[i]-i+1, p=i;
    }
    printf("%d %d",p,ans);
    return 0;
}

Compilation message (stderr)

xor.cpp:5:1: error: ‘map’ does not name a type
 map<int,int>ch;
 ^
xor.cpp: In function ‘int main()’:
xor.cpp:24:17: error: ‘ch’ was not declared in this scope
                 ch[sum[j]]=j;
                 ^
xor.cpp:26:49: error: ‘ch’ was not declared in this scope
             for(j=1;j<=n;j++) dap[j]=max(dap[j],ch[sum[j-1]^t]);
                                                 ^
xor.cpp:27:31: error: ‘ch’ was not declared in this scope
             for(j=1;j<=n;j++) ch[sum[j]]=0;
                               ^
xor.cpp:31:23: error: ‘ch’ was not declared in this scope
     for(j=1;j<=n;j++) ch[sum[j]]=j;
                       ^
xor.cpp:32:41: error: ‘ch’ was not declared in this scope
     for(j=1;j<=n;j++) dap[j]=max(dap[j],ch[sum[j-1]^t]);
                                         ^
xor.cpp:10:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&x);
                         ^
xor.cpp:11:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     for(i=1;i<=n;i++) scanf("%d",&a[i]);
                                        ^