제출 #499216

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
499216		LucaIlie	XOR Sum (info1cup17_xorsum)	C++17	0 / 100	775 ms	8096 KiB

xorsum

#include <iostream>
#include <algorithm>
#include <math.h>

#define MAX_N 1000000

using namespace std;

int v[MAX_N], rest[MAX_N];

int countLower( int v[], int n, int a ) {
    int st, dr, mij;

    st = 0;
    dr = n;
    while ( dr - st > 1 ) {
        mij = (st + dr) / 2;

        if ( v[mij] > a )
            dr = mij;
        else
            st = mij;
    }

    if ( v[st] > a )
        return 0;
    return st + 1;
}

int main() {
    int n, maxLog2, st, dr, leftR, rightR, res, i, p;
    long long nrSume;

    cin >> n;
    maxLog2 = 0;
    for ( i = 0; i < n; i++ ) {
        cin >> v[i];
        if ( log2( v[i] ) > maxLog2 )
            maxLog2 = log2( v[i] );
    }

    res = 0;
    for ( p = 0; p <= maxLog2 + 1; p++ ) {
        for ( i = 0; i < n; i++ )
            rest[i] = v[i] & ((1 << (p + 1)) - 1);
        sort( rest, rest + n );

        /*nrSume = 0;
        st = dr = 0;
        for ( i = 0; i < n; i++ ) {
            leftR = (1 << p) - rest[i];
            if ( leftR < 0 )
                leftR += (1 << (p + 1));
            rightR = (1 << (p + 1)) - 1 - rest[i];
            if ( rightR < 0 )
                rightR += (1 << (p + 1));

            if ( rest[st] > leftR )
                st = 0;
            while ( st < n && rest[st] < leftR )
                st++;

            if ( rest[dr] > rightR )
                dr = 0;
            while ( dr < n && rest[dr] <= rightR )
                dr++;

            if ( leftR <= rightR ) {
                nrSume += dr - st;
                if ( leftR <= rest[i] && rest[i] <= rightR )
                    nrSume++;
            } else {
                nrSume += n - st + dr;
                if ( leftR <= rest[i] || rest[i] <= rightR )
                    nrSume++;
            }

            if ( st == n )
                st--;
            if ( dr == n )
                dr--;
        }
        nrSume /= 2;

        if ( nrSume % 2 == 1 )
            res += (1 << p);*/
    }

    cout << res;

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

xorsum.cpp: In function 'int main()':
xorsum.cpp:31:21: warning: unused variable 'st' [-Wunused-variable]
   31 |     int n, maxLog2, st, dr, leftR, rightR, res, i, p;
      |                     ^~
xorsum.cpp:31:25: warning: unused variable 'dr' [-Wunused-variable]
   31 |     int n, maxLog2, st, dr, leftR, rightR, res, i, p;
      |                         ^~
xorsum.cpp:31:29: warning: unused variable 'leftR' [-Wunused-variable]
   31 |     int n, maxLog2, st, dr, leftR, rightR, res, i, p;
      |                             ^~~~~
xorsum.cpp:31:36: warning: unused variable 'rightR' [-Wunused-variable]
   31 |     int n, maxLog2, st, dr, leftR, rightR, res, i, p;
      |                                    ^~~~~~
xorsum.cpp:32:15: warning: unused variable 'nrSume' [-Wunused-variable]
   32 |     long long nrSume;
      |               ^~~~~~

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