Submission #523568

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
523568	2022-02-07 19:32:24	RaresFelix	Chessboard (IZhO18_chessboard)	C++17	39 / 100	483 ms	2544 KiB

chessboard

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#include <bits/stdc++.h>
#define MN 107171
using namespace std;
using ll = long long;
int n, k;
vector<tuple<int, int, int, int>> R;
ll calc(ll a, ll b, ll l) {
    if(a % l == 0 && b % l == 0)
        return ((a / l) * (b / l) + 1) / 2 * l * l;
    if(a % l) {
        ll nrseg;
        if(a / l % 2ll == 0) {
            if(b % (2ll * l) <= l) nrseg = (b / (2ll * l)) * l + b % (2 * l);
            else nrseg =  (b / (2ll * l) + 1) * l;
        } else {
            if(b % (2ll * l) <= l) nrseg = (b / (2ll * l)) * l;
            else nrseg = (b / (2ll * l) - 1) * l + b % (2 * l);
        }
        return calc(a - (a % l), b, l) + (a % l) * nrseg;
    }
    return calc(b, a, l);
}
ll sol(int l) {
    ll arie = ((n / l) * (n / l) + 1) / 2 * l * l, selec, hash;
    for(auto [a, b, c, d] : R) {
        selec = calc(c, d, l) + calc(a-1, b-1, l) - calc(c, b-1, l) - calc(a-1, d, l);
        arie += (c - a + 1) * (d - b + 1) - 2 * selec;
    }
 
 
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Compilation message (stderr)

chessboard.cpp: In function 'll sol(int)':
chessboard.cpp:26:59: warning: unused variable 'hash' [-Wunused-variable]
   26 |     ll arie = ((n / l) * (n / l) + 1) / 2 * l * l, selec, hash;
      |                                                           ^~~~

• Subtask 1: 8 / 8
• Subtask 2: 0 / 8
• Subtask 3: 15 / 15
• Subtask 4: 16 / 16
• Subtask 5: 0 / 23
• Subtask 6: 0 / 30