oj.uz

Submission #491511

# Submission time Handle Problem Language Result Execution time Memory
491511 2021-12-02T18:34:37 Z Yazan_Alattar Divide and conquer (IZhO14_divide) C++14
100 / 100
 50 ms 6964 KB 
#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
#include <algorithm>
#include <set>
#include <map>
#include <queue>
#include <list>
#include <utility>
#include <cmath>
#include <assert.h>
#include <numeric>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pb push_back
#define endl "\n"
#define all(x) x.begin(), x.end()
const int M = 100007;
const ll inf = 1e18;
const ll mod = 1e9 + 7;
const double pi = acos(-1);
const int dx[] = {1, 0, -1, 0}, dy[] = {0, 1, 0, -1};

ll n, x[M], g[M], d[M], seg[4 * M], ans, add;

void upd(int i, ll v, int node = 1, int l = 1, int r = n)
{
    if(l == r){
        seg[node] = v;
        return;
    }
    int mid = (l + r) / 2;
    if(i <= mid) upd(i, v, 2 * node, l, mid);
    else upd(i, v, 2 * node + 1, mid + 1, r);
    seg[node] = max(seg[2 * node], seg[2 * node + 1]);
    return;
}

int get(int st, int en, int node = 1, int l = 1, int r = n)
{
    if(seg[node] + add < 0) return -1;
    if(l == r) return l;
    int mid = (l + r) / 2;
    int ret = get(st, en, 2 * node + 1, mid + 1, r);
    if(ret == -1) ret = get(st, en, 2 * node, l, mid);
    return ret;
}

int main()
{
    scanf("%lld", &n);
    for(int i = 1; i <= n; ++i){
        scanf("%lld%lld%lld", &x[i], &g[i], &d[i]);
        g[i] += g[i - 1];
        d[i] += d[i - 1];
        upd(i, d[i] - x[i]);
    }
    for(int i = 1; i <= n; ++i){
        add += x[i] - x[i - 1];
        if(i > 1) add += -d[i - 1] + d[i - 2];
        ans = max(ans, g[get(i, n)] - g[i - 1]);
    }
    printf("%lld\n", ans);
    return 0;
}
// Don't forget special cases. (n = 1?)
// Look for the constraints. (Runtime array? overflow?)

Compilation message

divide.cpp: In function 'int main()':
divide.cpp:54:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |     scanf("%lld", &n);
      |     ~~~~~^~~~~~~~~~~~
divide.cpp:56:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         scanf("%lld%lld%lld", &x[i], &g[i], &d[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct

Subtask #2
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 1 ms 332 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 3 ms 460 KB Output is correct
24 Correct 2 ms 460 KB Output is correct

Subtask #3
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 1 ms 332 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 3 ms 460 KB Output is correct
24 Correct 2 ms 460 KB Output is correct
25 Correct 2 ms 460 KB Output is correct
26 Correct 4 ms 716 KB Output is correct
27 Correct 4 ms 716 KB Output is correct
28 Correct 21 ms 2428 KB Output is correct
29 Correct 23 ms 2408 KB Output is correct
30 Correct 47 ms 4592 KB Output is correct
31 Correct 42 ms 4676 KB Output is correct
32 Correct 44 ms 4732 KB Output is correct
33 Correct 40 ms 4664 KB Output is correct
34 Correct 50 ms 4552 KB Output is correct
35 Correct 48 ms 6812 KB Output is correct
36 Correct 49 ms 6964 KB Output is correct