oj.uz

Submission #334527

# Submission time Handle Problem Language Result Execution time Memory
334527 2020-12-09T10:13:25 Z talant117408 Chessboard (IZhO18_chessboard) C++17
100 / 100
 1688 ms 2048 KB 
/*
    Code written by Talant I.D.
*/
  
#include <bits/stdc++.h>
  
using namespace std;
  
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
  
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
  
inline bool isvowel(char ch){
    ch = tolower(ch);
    return (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u');
}
  
inline bool isprime(int n){
    if(n < 2 || (n%2 == 0 && n != 2)) return false;
    for(int i = 3; i*i <= n; i++)
        if(n%i == 0) return false;
    return true;
}
 
class Union{
    private:
        vector <int> saizu, link;
    public:
        Union(int n){
            saizu.assign(n, 1); link.resize(n); 
            iota(all(link), 0);
        }
        int find(int n){
            if(link[n] == n) return n;
            return link[n] = find(link[n]);
        }
        int same(int a, int b){
            return find(a) == find(b);
        }
        void unite(int a, int b){
            if(same(a, b)) return;
             
            a = find(a); b = find(b);
            if(saizu[a] < saizu[b]) swap(a, b);
             
            saizu[a] += saizu[b];
            link[b] = a;
        }
        int getsize(int a){
            return saizu[find(a)];
        }
};
 
const int mod = 1e9+7;
 
ll mode(ll a){
    a %= mod;
    if(a < 0) a += mod;
    return a;
}
 
ll subt(ll a, ll b){
    return mode(mode(a)-mode(b));
}
 
ll add(ll a, ll b){
    return mode(mode(a)+mode(b));
}
 
ll mult(ll a, ll b){
    return mode(mode(a)*mode(b));
}
 
ll binpow(ll a, ll b){
    ll res = 1;
    while(b){
        if(b&1) res = mult(res, a);
        a = mult(a, a);
        b >>= 1;
    }
    return res;
}

const int N = 1e5+7;
ll n, k;
int y11[N], x1[N], x2[N], y2[N];

inline ll rect_size(ll x1, ll y1, ll x2, ll y2){
    return (x2-x1+1)*(y2-y1+1);
}

inline ll pref(ll x, ll y, ll div){
    ll res = 0;
    ll x_1_mod_div = (x+1)%div, y_1_mod_div = (y+1)%div;
    ll x_full = x-x_1_mod_div, y_full = y-y_1_mod_div;
    ll full_s1 = (x_full+1)/div, full_s2 = (y_full+1)/div;
    ll x_full_div = (x_full+1)/div, y_full_div = (y_full+1)/div;
    
    res += ((full_s1*full_s2)&1 ? full_s1*full_s2/2+1 : full_s1*full_s2/2)*div*div;
    
    ll tmp;
    if((y_full_div)&1){
        int flag = x/div+y_full/div;
        if(flag&1){
            res += (x_1_mod_div)*(y_full_div/2)*div;
        }
        else{
            res += (x_1_mod_div)*(y_full_div/2+1)*div;
        }
    }
    else{
        tmp = (y_full+1)/2*(x_1_mod_div);
        res += tmp;
    }
    if((x_full_div)&1){
        int flag = y/div+x_full/div;
        if(flag&1){
            res += (y_1_mod_div)*(x_full_div/2)*div;
        }
        else{
            res += (y_1_mod_div)*(x_full_div/2+1)*div;
        }
    }
    else{
        tmp = (x_full+1)/2*(y_1_mod_div);
        res += tmp;
    }
    
    int flag = x/div+y/div;
    if(!(flag&1)){
        res += rect_size(x_full+1, y_full+1, x, y);
    }
    
    return res;
}

inline ll calc1(ll div){
    ll to_white = 0, to_black = ((n*n/div/div)&1 ? (n*n/div/div/2+1)*div*div : (n*n/2));
    for(ll i = 0; i < k; i++){
        ll blacks_in = pref(x2[i], y2[i], div)-(x1[i]-1 > -1 ? pref(x1[i]-1, y2[i], div) : 0)-(y11[i]-1 > -1 ? pref(x2[i], y11[i]-1, div) : 0)+
                      ((x1[i]-1 > -1) && (y11[i]-1 > -1) ? pref(x1[i]-1, y11[i]-1, div) : 0);
        to_black -= blacks_in;
        to_white += rect_size(x1[i], y11[i], x2[i], y2[i])-blacks_in;
    }
    
    return to_white+to_black;
}

int main(){
    //do_not_disturb
    
    ll ans = 2e18, i;
    scanf("%lld%lld", &n, &k);
    
    for(i = 0; i < k; i++){
        scanf("%d%d%d%d", &x1[i], &y11[i], &x2[i], &y2[i]);
        x1[i]--; y11[i]--; x2[i]--; y2[i]--;
    }
    
    for(i = 1; i*i <= n; i++){
        if(n%i == 0){
            auto tmp = calc1(i);
            ans = min(ans, min(tmp, n*n-tmp));
            if(i > 1){
                tmp = calc1(n/i);
                ans = min(ans, min(tmp, n*n-tmp));
            }
        }
    }
    
    printf("%lld", ans);
    
    return 0;
}

Compilation message

chessboard.cpp: In function 'int main()':
chessboard.cpp:167:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  167 |     scanf("%lld%lld", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~
chessboard.cpp:170:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  170 |         scanf("%d%d%d%d", &x1[i], &y11[i], &x2[i], &y2[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 0 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 0 ms 364 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 1260 KB Output is correct
2 Correct 9 ms 620 KB Output is correct
3 Correct 21 ms 1004 KB Output is correct
4 Correct 23 ms 1004 KB Output is correct
5 Correct 29 ms 1260 KB Output is correct
6 Correct 19 ms 876 KB Output is correct
7 Correct 4 ms 492 KB Output is correct
8 Correct 19 ms 876 KB Output is correct
9 Correct 48 ms 1772 KB Output is correct
10 Correct 27 ms 1132 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 2 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 2 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 19 ms 768 KB Output is correct
17 Correct 38 ms 1664 KB Output is correct
18 Correct 68 ms 1900 KB Output is correct
19 Correct 316 ms 1644 KB Output is correct
20 Correct 348 ms 2048 KB Output is correct
21 Correct 37 ms 1656 KB Output is correct
22 Correct 1 ms 364 KB Output is correct
23 Correct 50 ms 1024 KB Output is correct
24 Correct 63 ms 1772 KB Output is correct
25 Correct 10 ms 492 KB Output is correct
26 Correct 41 ms 1388 KB Output is correct
27 Correct 64 ms 1536 KB Output is correct
28 Correct 66 ms 1772 KB Output is correct
29 Correct 16 ms 876 KB Output is correct
30 Correct 2 ms 364 KB Output is correct

Subtask #5
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 1260 KB Output is correct
2 Correct 9 ms 620 KB Output is correct
3 Correct 21 ms 1004 KB Output is correct
4 Correct 23 ms 1004 KB Output is correct
5 Correct 29 ms 1260 KB Output is correct
6 Correct 19 ms 876 KB Output is correct
7 Correct 4 ms 492 KB Output is correct
8 Correct 19 ms 876 KB Output is correct
9 Correct 48 ms 1772 KB Output is correct
10 Correct 27 ms 1132 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 2 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 1 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 1 ms 364 KB Output is correct
26 Correct 19 ms 768 KB Output is correct
27 Correct 38 ms 1664 KB Output is correct
28 Correct 68 ms 1900 KB Output is correct
29 Correct 316 ms 1644 KB Output is correct
30 Correct 348 ms 2048 KB Output is correct
31 Correct 37 ms 1656 KB Output is correct
32 Correct 1 ms 364 KB Output is correct
33 Correct 50 ms 1024 KB Output is correct
34 Correct 63 ms 1772 KB Output is correct
35 Correct 10 ms 492 KB Output is correct
36 Correct 41 ms 1388 KB Output is correct
37 Correct 64 ms 1536 KB Output is correct
38 Correct 66 ms 1772 KB Output is correct
39 Correct 16 ms 876 KB Output is correct
40 Correct 2 ms 364 KB Output is correct
41 Correct 278 ms 1644 KB Output is correct
42 Correct 73 ms 1792 KB Output is correct
43 Correct 149 ms 1644 KB Output is correct
44 Correct 72 ms 1772 KB Output is correct
45 Correct 54 ms 1900 KB Output is correct
46 Correct 328 ms 2028 KB Output is correct
47 Correct 53 ms 1644 KB Output is correct
48 Correct 112 ms 1644 KB Output is correct
49 Correct 66 ms 1644 KB Output is correct
50 Correct 1490 ms 1900 KB Output is correct
51 Correct 1589 ms 2028 KB Output is correct
52 Correct 1489 ms 1900 KB Output is correct
53 Correct 1593 ms 1960 KB Output is correct
54 Correct 1465 ms 1900 KB Output is correct
55 Correct 1654 ms 2028 KB Output is correct
56 Correct 1424 ms 1772 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 0 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 0 ms 364 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 33 ms 1260 KB Output is correct
10 Correct 9 ms 620 KB Output is correct
11 Correct 21 ms 1004 KB Output is correct
12 Correct 23 ms 1004 KB Output is correct
13 Correct 29 ms 1260 KB Output is correct
14 Correct 19 ms 876 KB Output is correct
15 Correct 4 ms 492 KB Output is correct
16 Correct 19 ms 876 KB Output is correct
17 Correct 48 ms 1772 KB Output is correct
18 Correct 27 ms 1132 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 2 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 1 ms 364 KB Output is correct
26 Correct 1 ms 364 KB Output is correct
27 Correct 1 ms 364 KB Output is correct
28 Correct 1 ms 364 KB Output is correct
29 Correct 1 ms 364 KB Output is correct
30 Correct 1 ms 364 KB Output is correct
31 Correct 1 ms 364 KB Output is correct
32 Correct 1 ms 364 KB Output is correct
33 Correct 1 ms 364 KB Output is correct
34 Correct 19 ms 768 KB Output is correct
35 Correct 38 ms 1664 KB Output is correct
36 Correct 68 ms 1900 KB Output is correct
37 Correct 316 ms 1644 KB Output is correct
38 Correct 348 ms 2048 KB Output is correct
39 Correct 37 ms 1656 KB Output is correct
40 Correct 1 ms 364 KB Output is correct
41 Correct 50 ms 1024 KB Output is correct
42 Correct 63 ms 1772 KB Output is correct
43 Correct 10 ms 492 KB Output is correct
44 Correct 41 ms 1388 KB Output is correct
45 Correct 64 ms 1536 KB Output is correct
46 Correct 66 ms 1772 KB Output is correct
47 Correct 16 ms 876 KB Output is correct
48 Correct 2 ms 364 KB Output is correct
49 Correct 278 ms 1644 KB Output is correct
50 Correct 73 ms 1792 KB Output is correct
51 Correct 149 ms 1644 KB Output is correct
52 Correct 72 ms 1772 KB Output is correct
53 Correct 54 ms 1900 KB Output is correct
54 Correct 328 ms 2028 KB Output is correct
55 Correct 53 ms 1644 KB Output is correct
56 Correct 112 ms 1644 KB Output is correct
57 Correct 66 ms 1644 KB Output is correct
58 Correct 1490 ms 1900 KB Output is correct
59 Correct 1589 ms 2028 KB Output is correct
60 Correct 1489 ms 1900 KB Output is correct
61 Correct 1593 ms 1960 KB Output is correct
62 Correct 1465 ms 1900 KB Output is correct
63 Correct 1654 ms 2028 KB Output is correct
64 Correct 1424 ms 1772 KB Output is correct
65 Correct 1 ms 364 KB Output is correct
66 Correct 1 ms 364 KB Output is correct
67 Correct 1561 ms 1912 KB Output is correct
68 Correct 1559 ms 2028 KB Output is correct
69 Correct 1369 ms 1772 KB Output is correct
70 Correct 1544 ms 1900 KB Output is correct
71 Correct 1512 ms 1900 KB Output is correct
72 Correct 1508 ms 1804 KB Output is correct
73 Correct 1443 ms 1900 KB Output is correct
74 Correct 1546 ms 1900 KB Output is correct
75 Correct 1509 ms 1820 KB Output is correct
76 Correct 1590 ms 1900 KB Output is correct
77 Correct 238 ms 1900 KB Output is correct
78 Correct 72 ms 1772 KB Output is correct
79 Correct 159 ms 1772 KB Output is correct
80 Correct 167 ms 1772 KB Output is correct
81 Correct 151 ms 1644 KB Output is correct
82 Correct 122 ms 1900 KB Output is correct
83 Correct 94 ms 1772 KB Output is correct
84 Correct 927 ms 2028 KB Output is correct
85 Correct 1649 ms 1900 KB Output is correct
86 Correct 2 ms 364 KB Output is correct
87 Correct 1 ms 364 KB Output is correct
88 Correct 1688 ms 2028 KB Output is correct
89 Correct 321 ms 748 KB Output is correct
90 Correct 1 ms 364 KB Output is correct