Submission #337945

#	Time	Username	Problem	Language	Result	Execution time	Memory
337945		kutbilim_one	Bootfall (IZhO17_bootfall)	C++14	100 / 100	379 ms	5992 KiB

bootfall

/** kutbilim.one **/
#include <bits/stdc++.h>
 
using namespace std;
 
#define all(x) x.begin(),x.end()
#define int long long
#define endl '\n'
                                /*
ifstream in("test.txt"); 
#define cin in                    */
 
const int MAX = 500*500+1; 
	

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
 
	int n; cin >> n;
	vector<int> a(n);

	vector<int> dp(MAX, 0);
	vector<int> used(MAX, 1);
	dp[0] = 1;
	int sum = 0;
	for(int i = 0; i < n; i++){ 
		cin >> a[i];
        for(int x = sum; x >= 0; x--)
   			dp[x+a[i]] += dp[x];
    	sum += a[i];
    }

    if(sum%2 == 1 || dp[sum/2] == 0) return cout << 0, 0;
 
    for(int ex = 0; ex < n; ex++){
    	int left = sum-a[ex];
    	for(int x = 0; x <= left; x++)
    		dp[x + a[ex]] -= dp[x];
    
       	for(int right = 0; right <= MAX; right++)
    		if((left+right)%2 == 1 || dp[(left+right)/2] == 0) used[right] = 0;
   	
   		for(int x = left; x >= 0; x--)
   			dp[x + a[ex]] += dp[x]; 	
    }
 
    vector<int> res;
    for(int i = 0; i <= MAX; i++){
    	if(used[i]) res.push_back(i);	
    } 
 
    cout << res.size() << endl;
    for(auto i : res) cout << i << " ";
 
    return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:41:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   41 |         for(int right = 0; right <= MAX; right++)
      |         ^~~
bootfall.cpp:44:6: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   44 |      for(int x = left; x >= 0; x--)
      |      ^~~

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 15 / 15
• Subtask 4: 16 / 16
• Subtask 5: 21 / 21
• Subtask 6: 35 / 35