Submission #1067096

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067096		manhlinh1501	Bigger segments (IZhO19_segments)	C++17	100 / 100	85 ms	46416 KiB

segments

#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
const int MAXN = 5e5 + 5;
using pli = pair<i64, int>;
using pii = pair<int, int>;
const i64 oo64 = 5e15 + 5;

int N;
int a[MAXN];
i64 b[MAXN];
pli dp[MAXN];
vector<int> g[MAXN];

signed main() {
#define TASK "code"

    if (fopen(TASK ".inp", "r")) {
        freopen(TASK ".inp", "r", stdin);
        freopen(TASK ".out", "w", stdout);
    }

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> N;
    for(int i = 1; i <= N; i++) cin >> a[i];
    for(int i = 1; i <= N; i++) b[i] = b[i - 1] + a[i];

    pii cur = {0, 0};
    for(int i = 1; i <= N; i++) {
        for(int j : g[i]) {
            if(dp[j].second > cur.second or (dp[j].second == cur.second and j > cur.first))
                cur = {j, dp[j].second};
        }
        dp[i] = {b[i] - b[cur.first], cur.second + 1};
        int p = lower_bound(b + 1, b + N + 1, dp[i].first + b[i]) - b;
        g[p].emplace_back(i);
    }
    cout << dp[N].second;
}

/**
4
2 3 1 7
**/

/**
5
6 2 3 9 13
**/

/**
3
3 1 2
**/

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen(TASK ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen(TASK ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 36 / 36
• Subtask 5: 27 / 27