Submission #715447

#	Time	Username	Problem	Language	Result	Execution time	Memory
715447		MDSPro	Bigger segments (IZhO19_segments)	C++17	37 / 100	1576 ms	3412 KiB

segments

// MDSPro
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")

#include "bits/stdc++.h"
#ifdef LOCAL
    #include "debug.h"
#else
    #define debug(x...) 42
#endif
#define all(x) (x).begin(),(x).end()

using namespace std;
using ll = long long;
using ld = long double;

const ld PI = 3.141592653589793;
const int MOD = 1e9+7;
const int INF = 1e9;
const ll INFLL = 4e18;
const double EPS = 1e-9;
const int MAXN = 1000*1007;

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

    int ans;
    vector dp(n+1,INFLL); dp[0] = 0;
    vector opt(n+1,1);
    for(int i = 1; i <= n; ++i){
        vector old = dp;
        vector best = opt;

        dp.assign(n+1,INFLL); opt.assign(n+1,n-1);
        debug(old);
        for(int j = n; j >= 1; --j){
            int l = best[j];
            int r = (j+1 > n ? j : min(opt[j+1],j));
            ll sum = 0; for(int k = j; k > r; --k) sum += a[k-1];
            for(int k = r; k >= l; --k){
                sum += a[k-1];

                if(sum >= old[k-1] && sum < dp[j]) {
                    dp[j] = sum;
                    opt[j] = k;
                }
            }
            debug(i,j,sum);
        }
        debug(dp);
        debug(opt);
        if(dp[n] == INFLL) break;
        ans = i;
    }

    cout << ans;
}

// #define TESTCASES
int main() {
    cin.tie(0)->sync_with_stdio(0);

    #ifdef LOCAL
        freopen("input.txt","r",stdin);
        freopen("output.txt","w",stdout);
        freopen("error.txt","w",stderr);
    #endif
    
    int t = 1;
    #ifdef TESTCASES
        cin >> t;
    #endif
    
    for(int i = 1; i <= t; ++i){
        solve(i);
        cout << "\n";
    }
}

Compilation message (stderr)

segments.cpp: In function 'void solve(int)':
segments.cpp:10:25: warning: statement has no effect [-Wunused-value]
   10 |     #define debug(x...) 42
      |                         ^~
segments.cpp:37:9: note: in expansion of macro 'debug'
   37 |         debug(old);
      |         ^~~~~
segments.cpp:10:25: warning: statement has no effect [-Wunused-value]
   10 |     #define debug(x...) 42
      |                         ^~
segments.cpp:50:13: note: in expansion of macro 'debug'
   50 |             debug(i,j,sum);
      |             ^~~~~
segments.cpp:10:25: warning: statement has no effect [-Wunused-value]
   10 |     #define debug(x...) 42
      |                         ^~
segments.cpp:52:9: note: in expansion of macro 'debug'
   52 |         debug(dp);
      |         ^~~~~
segments.cpp:10:25: warning: statement has no effect [-Wunused-value]
   10 |     #define debug(x...) 42
      |                         ^~
segments.cpp:53:9: note: in expansion of macro 'debug'
   53 |         debug(opt);
      |         ^~~~~
segments.cpp:58:13: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   58 |     cout << ans;
      |             ^~~

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