oj.uz

Submission #162885

# Submission time Handle Problem Language Result Execution time Memory
162885 2019-11-10T07:45:23 Z abacaba Bigger segments (IZhO19_segments) C++14
0 / 100
 2 ms 380 KB 
#include <iostream>
#include <string>
#include <unordered_map>
#include <cstring>
#include <chrono>
#include <vector>
#include <map>
#include <random>
#include <set>
#include <algorithm>
#include <math.h>
#include <cstdio>
#include <stdio.h>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <deque>
#include <cassert>
#include <stack>
using namespace std;

#define int long long

const int inf = 2e9;
const int mod = 1e9 + 7;
const int N = 5e5 + 15;
int n, m, a[N], p[N], maxp[N], dp[N];

main() {
    ios_base::sync_with_stdio(0); cout.tie(0); cin.tie(0);
    cin >> n;
    for(int i = 1; i <= n; ++i) {
        cin >> a[i];
        p[i] = p[i-1] + a[i];
        maxp[i] = max(maxp[i-1], p[i]);
    }
    for(int i = 1; i <= n; ++i) {
        int l = 1, r = i - 1;
        dp[i] = 1;
        while(l <= r) {
            int mid = l + r >> 1;
            if(2 * p[mid] - maxp[mid - 1] <= p[i] && dp[mid])
                dp[i] = max(dp[i], dp[mid] + 1), l = mid + 1;
            else
                r = mid - 1;
        }
    }
    cout << dp[n] << endl;
    return 0;
}

Compilation message

segments.cpp:29:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
segments.cpp: In function 'int main()':
segments.cpp:41:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
             int mid = l + r >> 1;
                       ~~^~~

Subtask #1
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 380 KB Output is correct
2 Correct 2 ms 380 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Incorrect 2 ms 380 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 380 KB Output is correct
2 Correct 2 ms 380 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Incorrect 2 ms 380 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 380 KB Output is correct
2 Correct 2 ms 380 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Incorrect 2 ms 380 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 380 KB Output is correct
2 Correct 2 ms 380 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Incorrect 2 ms 380 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 380 KB Output is correct
2 Correct 2 ms 380 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Incorrect 2 ms 380 KB Output isn't correct
5 Halted 0 ms 0 KB -