Submission #376296

#	Time	Username	Problem	Language	Result	Execution time	Memory
376296		Halogen	Bigger segments (IZhO19_segments)	C++14	0 / 100	145 ms	262144 KiB

segments

#include <bits/stdc++.h>

using namespace std;

#define int long long

int N, presum[500005];

int memo[505][505][505];

int dp(int x, int y, int z) {
    if (memo[x][y][z] != -1) return memo[x][y][z];

    int ans = 0, preseg = presum[z - 1] - presum[y], curseg = presum[x - 1] - presum[y];
    if (x >= N) {
        if (curseg - preseg + presum[x] - presum[x - 1] >= 0) ans = 0;
        else ans = -10234567898765432;
    }
    else if (curseg - preseg < 0) ans = dp(x + 1, y, z);
    else ans = max(
        dp(x + 1, y, z),
        1 + dp(x + 1, x, z)
    );

    // printf("%lld %lld %lld\n", ans, x, seg);
    return memo[x][y][z] = ans; 
}

main() {
    scanf("%lld", &N);
    memset(memo, -1, sizeof(memo));
    for (int i = 1; i <= N; i++) scanf("%lld", &presum[i]);
    for (int i = 2; i <= N; i++) presum[i] += presum[i - 1];

    printf("%lld\n", dp(1, 0, 0));
}

Compilation message (stderr)

segments.cpp:29:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   29 | main() {
      |      ^
segments.cpp: In function 'int main()':
segments.cpp:30:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |     scanf("%lld", &N);
      |     ~~~~~^~~~~~~~~~~~
segments.cpp:32:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   32 |     for (int i = 1; i <= N; i++) scanf("%lld", &presum[i]);
      |                                  ~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27