oj.uz

Submission #893877

# Submission time Handle Problem Language Result Execution time Memory
893877 2023-12-27T15:36:07 Z Darren0724 Monochrome Points (JOI20_monochrome) C++17
100 / 100
 1228 ms 6236 KB 
#pragma GCC optimize("Ofast","O3","unroll-loops")
#pragma GCC target("avx2")
#include <bits/stdc++.h>
using namespace std;
#define ll long long 
#define LCBorz ios_base::sync_with_stdio(false); cin.tie(0);
#define all(x) x.begin(), x.end()
#define endl '\n'
#define x first
#define y second
const int N=400005;
const int INF=1e18;
const int mod=924844033;
struct BIT{
    vector<int> v=vector<int>(N);
    void add(int p,int t){
        for(int i=p;i<N;i+=i&(-i)){
            v[i]+=t;
        }
    }
    ll ask(int p){
        ll ans=0;
        for(int i=p;i>0;i-=i&(-i)){
            ans+=v[i];
        }
        return ans;
    }
};
int32_t main() {
    LCBorz;
    int n;cin>>n;
    string s;cin>>s;
    vector<int> a,b;
    for(int i=0;i<n<<1;i++){
        if(s[i]=='W'){
            a.push_back(i+1);
        }
        else{
            b.push_back(i+1);
        }
    }    
    auto solve=[&](int k)->ll {
        vector<pair<int,int>> v(n);
        BIT bit;
        for(int i=0;i<n;i++){
            v[i]=make_pair(a[i],b[(i+k)%n]);
            if(v[i].x>v[i].y){
                swap(v[i].x,v[i].y);
            }
            bit.add(v[i].x,1);
            bit.add(v[i].y,-1);
        }
        ll ans=0;
        sort(all(v));
        for(int i=0;i<n;i++){
            ans+=bit.ask(v[i].y-1)-bit.ask(v[i].x);
            bit.add(v[i].x,-1);
            bit.add(v[i].y,2);
        }
        return ans;
    };
    ll ans=0;
    int l=0,r=n+1;
    while(r-l>4){
        int m=(l+r)>>1;
        if(solve(m)>solve(m+1)){
            r=m+1;
        }
        else{
            l=m-1;
        }
    }
    for(int i=l;i<=r;i++){
        ans=max(ans,solve(i));
    }
    cout<<ans/2<<endl;

    return 0;
}

Compilation message

monochrome.cpp:12:15: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   12 | const int INF=1e18;
      |               ^~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1880 KB Output is correct
2 Correct 1 ms 1884 KB Output is correct
3 Correct 1 ms 1884 KB Output is correct
4 Correct 1 ms 1884 KB Output is correct
5 Correct 1 ms 1884 KB Output is correct
6 Correct 2 ms 1884 KB Output is correct
7 Correct 2 ms 1884 KB Output is correct
8 Correct 1 ms 2136 KB Output is correct
9 Correct 1 ms 1884 KB Output is correct
10 Correct 2 ms 1884 KB Output is correct
11 Correct 2 ms 1884 KB Output is correct
12 Correct 1 ms 1884 KB Output is correct
13 Correct 1 ms 1884 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1880 KB Output is correct
2 Correct 1 ms 1884 KB Output is correct
3 Correct 1 ms 1884 KB Output is correct
4 Correct 1 ms 1884 KB Output is correct
5 Correct 1 ms 1884 KB Output is correct
6 Correct 2 ms 1884 KB Output is correct
7 Correct 2 ms 1884 KB Output is correct
8 Correct 1 ms 2136 KB Output is correct
9 Correct 1 ms 1884 KB Output is correct
10 Correct 2 ms 1884 KB Output is correct
11 Correct 2 ms 1884 KB Output is correct
12 Correct 1 ms 1884 KB Output is correct
13 Correct 1 ms 1884 KB Output is correct
14 Correct 3 ms 1884 KB Output is correct
15 Correct 3 ms 1884 KB Output is correct
16 Correct 2 ms 2136 KB Output is correct
17 Correct 3 ms 1884 KB Output is correct
18 Correct 2 ms 1884 KB Output is correct
19 Correct 3 ms 1880 KB Output is correct
20 Correct 3 ms 2044 KB Output is correct
21 Correct 3 ms 2036 KB Output is correct
22 Correct 3 ms 1888 KB Output is correct
23 Correct 2 ms 1884 KB Output is correct
24 Correct 2 ms 1884 KB Output is correct
25 Correct 2 ms 1884 KB Output is correct
26 Correct 3 ms 1880 KB Output is correct
27 Correct 2 ms 1880 KB Output is correct
28 Correct 3 ms 2136 KB Output is correct
29 Correct 2 ms 2036 KB Output is correct
30 Correct 2 ms 1880 KB Output is correct
31 Correct 3 ms 1884 KB Output is correct
32 Correct 2 ms 1880 KB Output is correct
33 Correct 2 ms 1884 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1880 KB Output is correct
2 Correct 1 ms 1884 KB Output is correct
3 Correct 1 ms 1884 KB Output is correct
4 Correct 1 ms 1884 KB Output is correct
5 Correct 1 ms 1884 KB Output is correct
6 Correct 2 ms 1884 KB Output is correct
7 Correct 2 ms 1884 KB Output is correct
8 Correct 1 ms 2136 KB Output is correct
9 Correct 1 ms 1884 KB Output is correct
10 Correct 2 ms 1884 KB Output is correct
11 Correct 2 ms 1884 KB Output is correct
12 Correct 1 ms 1884 KB Output is correct
13 Correct 1 ms 1884 KB Output is correct
14 Correct 3 ms 1884 KB Output is correct
15 Correct 3 ms 1884 KB Output is correct
16 Correct 2 ms 2136 KB Output is correct
17 Correct 3 ms 1884 KB Output is correct
18 Correct 2 ms 1884 KB Output is correct
19 Correct 3 ms 1880 KB Output is correct
20 Correct 3 ms 2044 KB Output is correct
21 Correct 3 ms 2036 KB Output is correct
22 Correct 3 ms 1888 KB Output is correct
23 Correct 2 ms 1884 KB Output is correct
24 Correct 2 ms 1884 KB Output is correct
25 Correct 2 ms 1884 KB Output is correct
26 Correct 3 ms 1880 KB Output is correct
27 Correct 2 ms 1880 KB Output is correct
28 Correct 3 ms 2136 KB Output is correct
29 Correct 2 ms 2036 KB Output is correct
30 Correct 2 ms 1880 KB Output is correct
31 Correct 3 ms 1884 KB Output is correct
32 Correct 2 ms 1880 KB Output is correct
33 Correct 2 ms 1884 KB Output is correct
34 Correct 8 ms 2084 KB Output is correct
35 Correct 8 ms 1884 KB Output is correct
36 Correct 8 ms 1884 KB Output is correct
37 Correct 8 ms 2080 KB Output is correct
38 Correct 7 ms 1884 KB Output is correct
39 Correct 8 ms 2392 KB Output is correct
40 Correct 8 ms 2076 KB Output is correct
41 Correct 7 ms 1880 KB Output is correct
42 Correct 8 ms 1956 KB Output is correct
43 Correct 8 ms 1884 KB Output is correct
44 Correct 8 ms 2080 KB Output is correct
45 Correct 8 ms 1884 KB Output is correct
46 Correct 9 ms 1884 KB Output is correct
47 Correct 8 ms 1884 KB Output is correct
48 Correct 8 ms 1884 KB Output is correct
49 Correct 7 ms 1884 KB Output is correct
50 Correct 8 ms 1884 KB Output is correct
51 Correct 7 ms 1884 KB Output is correct
52 Correct 8 ms 2088 KB Output is correct

Subtask #4
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1880 KB Output is correct
2 Correct 1 ms 1884 KB Output is correct
3 Correct 1 ms 1884 KB Output is correct
4 Correct 1 ms 1884 KB Output is correct
5 Correct 1 ms 1884 KB Output is correct
6 Correct 2 ms 1884 KB Output is correct
7 Correct 2 ms 1884 KB Output is correct
8 Correct 1 ms 2136 KB Output is correct
9 Correct 1 ms 1884 KB Output is correct
10 Correct 2 ms 1884 KB Output is correct
11 Correct 2 ms 1884 KB Output is correct
12 Correct 1 ms 1884 KB Output is correct
13 Correct 1 ms 1884 KB Output is correct
14 Correct 3 ms 1884 KB Output is correct
15 Correct 3 ms 1884 KB Output is correct
16 Correct 2 ms 2136 KB Output is correct
17 Correct 3 ms 1884 KB Output is correct
18 Correct 2 ms 1884 KB Output is correct
19 Correct 3 ms 1880 KB Output is correct
20 Correct 3 ms 2044 KB Output is correct
21 Correct 3 ms 2036 KB Output is correct
22 Correct 3 ms 1888 KB Output is correct
23 Correct 2 ms 1884 KB Output is correct
24 Correct 2 ms 1884 KB Output is correct
25 Correct 2 ms 1884 KB Output is correct
26 Correct 3 ms 1880 KB Output is correct
27 Correct 2 ms 1880 KB Output is correct
28 Correct 3 ms 2136 KB Output is correct
29 Correct 2 ms 2036 KB Output is correct
30 Correct 2 ms 1880 KB Output is correct
31 Correct 3 ms 1884 KB Output is correct
32 Correct 2 ms 1880 KB Output is correct
33 Correct 2 ms 1884 KB Output is correct
34 Correct 8 ms 2084 KB Output is correct
35 Correct 8 ms 1884 KB Output is correct
36 Correct 8 ms 1884 KB Output is correct
37 Correct 8 ms 2080 KB Output is correct
38 Correct 7 ms 1884 KB Output is correct
39 Correct 8 ms 2392 KB Output is correct
40 Correct 8 ms 2076 KB Output is correct
41 Correct 7 ms 1880 KB Output is correct
42 Correct 8 ms 1956 KB Output is correct
43 Correct 8 ms 1884 KB Output is correct
44 Correct 8 ms 2080 KB Output is correct
45 Correct 8 ms 1884 KB Output is correct
46 Correct 9 ms 1884 KB Output is correct
47 Correct 8 ms 1884 KB Output is correct
48 Correct 8 ms 1884 KB Output is correct
49 Correct 7 ms 1884 KB Output is correct
50 Correct 8 ms 1884 KB Output is correct
51 Correct 7 ms 1884 KB Output is correct
52 Correct 8 ms 2088 KB Output is correct
53 Correct 1189 ms 5860 KB Output is correct
54 Correct 1171 ms 6084 KB Output is correct
55 Correct 1190 ms 6136 KB Output is correct
56 Correct 1150 ms 6108 KB Output is correct
57 Correct 1022 ms 6020 KB Output is correct
58 Correct 933 ms 6052 KB Output is correct
59 Correct 1032 ms 5900 KB Output is correct
60 Correct 1095 ms 6220 KB Output is correct
61 Correct 1127 ms 6108 KB Output is correct
62 Correct 1073 ms 6116 KB Output is correct
63 Correct 1182 ms 6116 KB Output is correct
64 Correct 948 ms 5988 KB Output is correct
65 Correct 1045 ms 6056 KB Output is correct
66 Correct 1060 ms 5820 KB Output is correct
67 Correct 1090 ms 5888 KB Output is correct
68 Correct 832 ms 5736 KB Output is correct
69 Correct 970 ms 6156 KB Output is correct
70 Correct 932 ms 5584 KB Output is correct
71 Correct 1147 ms 6076 KB Output is correct
72 Correct 845 ms 6064 KB Output is correct
73 Correct 1228 ms 6236 KB Output is correct