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Submission #167366

# Submission time Handle Problem Language Result Execution time Memory
167366 2019-12-07T17:40:46 Z theboatman Bigger segments (IZhO19_segments) C++17
0 / 100
 2 ms 376 KB 
#include <bits/stdc++.h>

#define fi first
#define se second

#define y1 theboatman

using namespace std;
typedef long long ll;

const int N = int(1e6) + 10;
const int inf = int(1e9) + 10;
const long long INF = ll(1e18) + 10;

vector <ll> pref;

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

int main() {
    cin.tie(0);
    ios::sync_with_stdio(0);

    int n;
    cin >> n;

    vector <int> a(n);
    for(int i = 0; i < n; i++) {
        cin >> a[i];
    }

    pref.resize(n);
    for(int i = 0; i < n; i++) {
        pref[i] = (i ? pref[i - 1] + a[i] : a[i]);
    }

    vector <pair <ll, int> > dp(n);
    for(int i = 0; i < n; i++) {
        dp[i] = {get(0, i), 1};
    }

    vector <pair <ll, int> > lazy(n, {INF, inf});

    pair <ll, int> now = {0LL, -1};
    for(int i = 0; i < n; i++) {
        now.fi += a[i];
        now = min(now, lazy[i]);

        dp[i] = min(dp[i], now);
        cout << "i: " << i << " " << dp[i].fi << " " << -dp[i].se << "\n";
        if (i + 1 == n || get(i + 1, n - 1) < now.fi) {
            continue;
        }

        int l = i + 1, r = n - 1;
        while(l < r) {
            int c = l + r >> 1;

            if (get(i + 1, c) < now.fi) {
                l = c + 1;
            }
            else {
                r = c;
            }
        }

        lazy[l] = min(lazy[l], {get(i + 1, l), now.se - 1});
    }

    cout << -dp[n - 1].se << "\n";
    return 0;
}
/*
*/

Compilation message

segments.cpp: In function 'int main()':
segments.cpp:58:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
             int c = l + r >> 1;
                     ~~^~~

Subtask #1
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 36.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -