Submission #1088838

#	Time	Username	Problem	Language	Result	Execution time	Memory
1088838		vjudge1	Bootfall (IZhO17_bootfall)	C++98	100 / 100	784 ms	4376 KiB

bootfall

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
#define block_of_code if(true)

ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll gcd(ll a, ll b){return __gcd(a, b);}
ll lcm(ll a, ll b){return a / gcd(a, b) * b;}

ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ll mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}

mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
double rngesus_d(double l, double r){
    double cur = rngesus(0, MASK(60) - 1);
    cur /= MASK(60) - 1;
    return l + cur * (r - l);
}

template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }

template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }

template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }

template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

const ll MOD = 1000000007LL * 1000000009;

int main(void){
    ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
    clock_t start = clock();

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

    int s = 0;
    for(int i: a) s += i;

    vector<ll> dp(s + 1);
    dp[0] = 1;
    for(int i: a){
        for(int j = s; j >= i; --j){
            dp[j] += dp[j - i];
            if (dp[j] >= MOD) dp[j] -= MOD;
        }
    }

    if (s % 2 || dp[s / 2] == 0){
        cout << 0 << "\n";
        return 0;
    }

    vector<int> valid;
    for(int i = 1; i<=s; ++i) valid.push_back(i);

    for(int i: a){
        for(int j = i; j <= s; ++j){
            dp[j] -= dp[j - i];
            if (dp[j] < 0) dp[j] += MOD;
        }
        int _s = s - i;
        vector<int> tmp; tmp.reserve(valid.size());
        for(int j: valid){
            int l = (_s - j), r = (_s + j);
            if (r <= s * 2 && r % 2 == 0 && dp[r / 2]){
                tmp.push_back(j);
            }
        }
        valid = tmp;

        for(int j = s; j >= i; --j){
            dp[j] += dp[j - i];
            if (dp[j] >= MOD) dp[j] -= MOD;
        }
    }

    cout << valid.size() << "\n";
    printArr(valid);

    cerr << "Time elapsed: " << clock() - start << " ms\n";
    return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:93:17: warning: unused variable 'l' [-Wunused-variable]
   93 |             int l = (_s - j), r = (_s + j);
      |                 ^

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