Submission #956896

#	Time	Username	Problem	Language	Result	Execution time	Memory
956896		Requiem	Bigger segments (IZhO19_segments)	C++17	37 / 100	1536 ms	8900 KiB

segments

#include<bits/stdc++.h>
#define int long long
#define pb push_back
#define fast ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#define MOD 1000000007
#define INF 1e18
#define fi first
#define se second
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define FORD(i,a,b) for(int i=a;i>=b;i--)
#define sz(a) ((int)(a).size())
#define endl '\n'
#define pi 3.14159265359
#define TASKNAME "segments"
template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }
using namespace std;
typedef pair<int,int> ii;
typedef pair<int,ii> iii;
typedef vector<int> vi;
const int MAXN = 5e5 + 9;
int n, a[MAXN], pre[MAXN];

ii dp[MAXN];

void upd(ii &a, ii b){
    if (a.fi < b.fi) a = b;
    else if (a.fi == b.fi and a.se > b.se) a = b;
}
main()
{
    fast;
    if (fopen(TASKNAME".inp","r")){
        freopen(TASKNAME".inp","r",stdin);
        freopen(TASKNAME".out","w",stdout);
    }
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        pre[i] = pre[i - 1] + a[i];
    }
    dp[0] = {0, 0};
    for(int i = 1; i <= n; i++){
        for(int j = i - 1; j >= 0; j--){
            if (pre[i] - pre[j] >= dp[j].se) upd(dp[i], ii(dp[j].fi + 1, pre[i] - pre[j]));
        }
//        cout << dp[i].fi << ' ' << dp[i].se << endl;
    }
    cout << dp[n].fi << endl;
}

Compilation message (stderr)

segments.cpp:30:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   30 | main()
      | ^~~~
segments.cpp: In function 'int main()':
segments.cpp:34:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         freopen(TASKNAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen(TASKNAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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