oj.uz

Submission #829941

# Submission time Handle Problem Language Result Execution time Memory
829941 2023-08-18T16:03:52 Z vjudge1 Candies (JOI18_candies) C++17
100 / 100
 513 ms 27248 KB 
#ifdef Home
#define _GLIBCXX_DEBUG
#endif // Home

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int N = 200200;

ll pref[N], ans, n;

ll get(int l, int r) {
    return pref[r] - (l > 1 ? pref[l - 2] : 0ll);
}

ll inv(int l, int r) {
    return l == r ? 0ll : get(l + 1, r - 1);
}

ll f(pair < int, int > seg) {
    auto &[l, r] = seg;
    return (l^r)&1 ? LLONG_MIN : get(l, r) - inv(l, r);
}

set < pair < int, int > > segs;
set < pair < ll, pair < int, int > > > flips;

void flip(int l, int r) {
    auto it = segs.find({l, r}), l_seg = it, r_seg = it;
    flips.erase(flips.find({f(*it), *it}));
    if(it != segs.begin()) {
        -- l_seg;
        flips.erase(flips.find({f(*l_seg), *l_seg})); 
        l = l_seg -> first;
        segs.erase(l_seg);
    }
    ++ r_seg;
    if(r_seg != segs.end()) {
        flips.erase(flips.find({f(*r_seg), *r_seg}));
        r = r_seg -> second;
        segs.erase(r_seg);
    }
    segs.erase(it);
    segs.insert({l, r});
    flips.insert({f({l, r}), {l, r}});
}

main() {
#ifdef Home
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif // Home
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;
    for(int i = 1; i <= n; ++ i) {
        cin >> pref[i];
        pref[i] += (i > 1 ? pref[i - 2] : 0ll);
        flips.insert({f({i, i}), {i, i}});
        segs.insert({i, i});
    }
    pref[n + 1] = pref[n - 1];

    for(int t = (n + 1) / 2; t --> 0;) {
        auto [l, r] = flips.rbegin()->second;
      //cout << l << ' ' << r << ' ' << flips.rbegin()->first << '\n';
        ans += flips.rbegin()->first;
        flip(l, r);
        /**
        for(auto &[val, t] : flips) {
            cout << val << ' ' << t.first << ' ' << t.second << '\n';
        }
        // */
        cout << ans << '\n';
    }   
}

Compilation message

candies.cpp:52:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   52 | main() {
      | ^~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 468 KB Output is correct
2 Correct 2 ms 672 KB Output is correct
3 Correct 3 ms 592 KB Output is correct
4 Correct 2 ms 596 KB Output is correct
5 Correct 2 ms 596 KB Output is correct
6 Correct 2 ms 600 KB Output is correct
7 Correct 3 ms 596 KB Output is correct
8 Correct 2 ms 600 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 2 ms 596 KB Output is correct
11 Correct 2 ms 536 KB Output is correct
12 Correct 2 ms 596 KB Output is correct
13 Correct 2 ms 596 KB Output is correct
14 Correct 2 ms 596 KB Output is correct
15 Correct 2 ms 596 KB Output is correct
16 Correct 2 ms 596 KB Output is correct
17 Correct 2 ms 596 KB Output is correct
18 Correct 2 ms 596 KB Output is correct
19 Correct 2 ms 600 KB Output is correct
20 Correct 2 ms 596 KB Output is correct

Subtask #2
92.0 / 92.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 468 KB Output is correct
2 Correct 2 ms 672 KB Output is correct
3 Correct 3 ms 592 KB Output is correct
4 Correct 2 ms 596 KB Output is correct
5 Correct 2 ms 596 KB Output is correct
6 Correct 2 ms 600 KB Output is correct
7 Correct 3 ms 596 KB Output is correct
8 Correct 2 ms 600 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 2 ms 596 KB Output is correct
11 Correct 2 ms 536 KB Output is correct
12 Correct 2 ms 596 KB Output is correct
13 Correct 2 ms 596 KB Output is correct
14 Correct 2 ms 596 KB Output is correct
15 Correct 2 ms 596 KB Output is correct
16 Correct 2 ms 596 KB Output is correct
17 Correct 2 ms 596 KB Output is correct
18 Correct 2 ms 596 KB Output is correct
19 Correct 2 ms 600 KB Output is correct
20 Correct 2 ms 596 KB Output is correct
21 Correct 375 ms 27248 KB Output is correct
22 Correct 371 ms 27204 KB Output is correct
23 Correct 513 ms 27208 KB Output is correct
24 Correct 161 ms 27004 KB Output is correct
25 Correct 209 ms 26992 KB Output is correct
26 Correct 175 ms 26944 KB Output is correct
27 Correct 187 ms 27192 KB Output is correct
28 Correct 188 ms 27204 KB Output is correct
29 Correct 188 ms 27200 KB Output is correct
30 Correct 188 ms 27128 KB Output is correct
31 Correct 275 ms 27228 KB Output is correct
32 Correct 198 ms 27176 KB Output is correct
33 Correct 291 ms 27000 KB Output is correct
34 Correct 299 ms 26996 KB Output is correct
35 Correct 339 ms 26956 KB Output is correct
36 Correct 393 ms 27180 KB Output is correct
37 Correct 355 ms 27212 KB Output is correct
38 Correct 379 ms 27164 KB Output is correct
39 Correct 176 ms 27024 KB Output is correct
40 Correct 187 ms 26960 KB Output is correct
41 Correct 196 ms 26976 KB Output is correct
42 Correct 200 ms 27196 KB Output is correct
43 Correct 195 ms 27192 KB Output is correct
44 Correct 184 ms 27232 KB Output is correct
45 Correct 220 ms 27236 KB Output is correct
46 Correct 204 ms 27120 KB Output is correct
47 Correct 221 ms 27220 KB Output is correct
48 Correct 272 ms 26916 KB Output is correct
49 Correct 272 ms 27040 KB Output is correct
50 Correct 265 ms 26976 KB Output is correct