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Submission #1040374

# Submission time Handle Problem Language Result Execution time Memory
1040374 2024-08-01T02:40:18 Z vjudge1 Divide and conquer (IZhO14_divide) C++17
100 / 100
 18 ms 6504 KB 
#include <bits/stdc++.h>
using namespace std;

#define f(i, a, b) for (int i = a; i <= b; i++)
#define fo(i, a, b) for (int i = a; i >= b; i--)
#define minimize(a, b) a = (a < b ? a : b)
#define maximize(a, b) a = (a > b ? a : b) 
#define int long long
#define fi first
#define se second
#define ll long long
#define pii pair <int, int>
#define pb push_back
#define pi acos(-1)
#define sz(a) (int)a.size()
#define getbit(a, b) (((a) >> (b)) & 1)
#define INOUT "main"
#define INFT 0x3f3f3f3f
#define debug(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); }
void err(istream_iterator<string> it) {}
template<typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args)
{
    cout << *it << " = [" << a << "]" << '\n';
    err(++it, args...);
}
#define debug1(a, st, en) { cout << #a << " = ["; int kt = false; f(i, st, en) {if (kt) cout << ", "; kt = true; cout << a[i];} cout << "]\n"; } 

void ctime()
{
    cerr << "\n" << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
}

void file()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    if (fopen(INOUT".INP", "r")) 
    {
        freopen(INOUT".INP", "r", stdin); 
        freopen(INOUT".OUT", "w", stdout);
    }
}

const int MX_N = 1e5 + 5;
int n;
int x[MX_N], g[MX_N], e[MX_N], mx[MX_N];

signed main()
{
    file();

    cin >> n;
    f(i, 1, n) 
    {
        cin >> x[i] >> g[i] >> e[i];

        g[i] += g[i - 1];
        e[i] += e[i - 1];
    }

    f(i, 1, n + 1) mx[i] = -1e15;
    fo(i, n, 1) mx[i] = max(mx[i + 1], e[i] - x[i]);

    ll res = 0;

    f(i, 1, n)
    {
        int l = i, r = n, ans;

        while(l <= r)
        {
            int mid = (l + r) / 2;

            if (mx[mid] >= e[i - 1] - x[i])
            {
                ans = mid;
                l = mid + 1;
            }
            else r = mid - 1;
        }

        maximize(res, g[ans] - g[i - 1]);
    }

    cout << res;

    ctime();
    return 0;
}

Compilation message

divide.cpp: In function 'void file()':
divide.cpp:40:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |         freopen(INOUT".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
divide.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen(INOUT".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
divide.cpp: In function 'int main()':
divide.cpp:83:28: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   83 |         maximize(res, g[ans] - g[i - 1]);
      |                            ^

Subtask #1
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 600 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 472 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 464 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct

Subtask #2
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 600 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 472 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 464 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 484 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 0 ms 528 KB Output is correct
21 Correct 0 ms 356 KB Output is correct
22 Correct 0 ms 540 KB Output is correct
23 Correct 1 ms 604 KB Output is correct
24 Correct 2 ms 612 KB Output is correct

Subtask #3
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 600 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 472 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 464 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 484 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 0 ms 528 KB Output is correct
21 Correct 0 ms 356 KB Output is correct
22 Correct 0 ms 540 KB Output is correct
23 Correct 1 ms 604 KB Output is correct
24 Correct 2 ms 612 KB Output is correct
25 Correct 1 ms 616 KB Output is correct
26 Correct 1 ms 872 KB Output is correct
27 Correct 2 ms 872 KB Output is correct
28 Correct 8 ms 3048 KB Output is correct
29 Correct 9 ms 3180 KB Output is correct
30 Correct 18 ms 6504 KB Output is correct
31 Correct 18 ms 5272 KB Output is correct
32 Correct 15 ms 5296 KB Output is correct
33 Correct 14 ms 5212 KB Output is correct
34 Correct 14 ms 5220 KB Output is correct
35 Correct 16 ms 5456 KB Output is correct
36 Correct 17 ms 5716 KB Output is correct