Submission #41573

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
41573	2018-02-19 09:19:57	cheater2k	Chessboard (IZhO18_chessboard)	C++14	100 / 100	1863 ms	2288 KiB

chessboard

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#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 5;
int n, k, nrec;
int lx[N], ly[N], rx[N], ry[N];
long long ans = 1e18;
int get(int t, int l, int r) {
    // count the number of x such that l <= x <= r and (x / k) % 2 == t
    if (l / k == r / k) {
        if ((l / k) % 2 == t) return r - l + 1; else return 0;
    }
    int ret = 0;
    if ((l / k) % 2 == t) ret += ((l / k) + 1) * k - l;
    if ((r / k) % 2 == t) ret += r - (r / k) * k + 1;
    
    l = (l / k) + 1;
    r = (r / k) - 1;
    if (l % 2 != t) ++l;
    if (r % 2 != t) --r;
    
    ret += max(0, (r - l) / 2 + 1) * k;
    return ret;
}
 
 
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