제출 #535291

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
535291		assass12	XOR Sum (info1cup17_xorsum)	C++14	0 / 100	1655 ms	13700 KiB

xorsum

#pragma GCC optimize("O3")
#include <unistd.h>
#include <bits/stdc++.h>
using namespace std;
namespace io {
	const signed IS=1<<20, OS=1<<18;
	char I[IS*32+1],*J=I,O[OS],*K=O;

	inline void daer(){if(J>=I+IS-64){char*p=I;do*p++=*J++;while(J!=I+IS);p[read(0,p,I+IS-p)]=0;J=I;}}
	template<int N=10,typename T=int>inline T getu(){daer();T x=0;int k=0;do x=x*10+*J-'0';while(*++J>='0'&&++k<N);++J;return x;}
	template<int N=10,typename T=int>inline T geti(){daer();bool e=*J=='-';J+=e;return(e?-1:1)*getu<N,T>();}
	inline void flush(){write(1,O,K-O);K=O;}

	template<int N=10,typename T=int>inline void putu(T n){char s[(N+7)/8*8],*p=s;int k=0;do*p++=n%10+48;while((n/=10)&&++k<N);do*K++=*--p;while(p!=s);*K++=10;if(K>=O+OS-64)flush();}
	template<int N=10,typename T=int>inline void puti(T n){if(n<0)*K++='-',n=-n;putu<N,T>(n);}
	struct f{f(){I[read(0,I,IS)]=0;}~f(){flush();}}flu;
};
using namespace io;
typedef long long ll;
const int MAX_N = 1000000;
const int MAX_LOGV = 30;
int arr[MAX_N];
int remain[MAX_N];
ll digitNum[MAX_LOGV];
void run(){
    int N = getu<7>();
    memset(digitNum,0,sizeof(digitNum));
    for(int i=0;i<N;i++){
        arr[i] = getu<9>();
    }
    for(int digit=0;digit<MAX_LOGV;digit++){
        for(int i=0;i<N;i++){
            remain[i] = arr[i]&((1<<(digit+1))-1);
        }
        sort(remain,remain+N);
        int lo,hi;
        for(int i=0;i<N;i++){
            lo = i;
            while(lo<N and !((remain[i]+remain[lo])&(1<<digit))) lo++;
            hi = lo;
            while(hi<N and ((remain[i]+remain[hi])&(1<<digit))) hi++;
            digitNum[digit]+=hi-lo;
        }
    }
    int ret = 0;
    for(int digit=0;digit<MAX_LOGV;digit++){
        ret+= (digitNum[digit]&1) ? (1<<digit) : 0;
    }
    putu(ret);
}


int main(){
    //ios_base::sync_with_stdio(false);
    //cin.tie(NULL);
    //cout.tie(NULL);
    run();
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

xorsum.cpp: In function 'void io::flush()':
xorsum.cpp:12:27: warning: ignoring return value of 'ssize_t write(int, const void*, size_t)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  inline void flush(){write(1,O,K-O);K=O;}
      |                      ~~~~~^~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23