Submission #873173

#	Time	Username	Problem	Language	Result	Execution time	Memory
873173		Mher777	Bootfall (IZhO17_bootfall)	C++17	28 / 100	1018 ms	25156 KiB

bootfall

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <iomanip>
#include <array>
#include <string>
#include <algorithm>
#include <cmath>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <utility>
#include <random>
#include <fstream>
using namespace std;

/* -------------------- Typedefs -------------------- */

typedef int itn;
typedef long long ll;
typedef unsigned long long ull;
typedef float fl;
typedef double db;
typedef long double ld;

/* -------------------- Usings -------------------- */

using vi = vector<int>;
using vll = vector<ll>;
using mii = map<int, int>;
using mll = map<ll, ll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

/* -------------------- Defines -------------------- */

#define ff first
#define ss second
#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define mpr make_pair
#define yes cout<<"Yes\n"
#define no cout<<"No\n"
#define all(x) (x).begin(), (x).end()

/* -------------------- Constants -------------------- */

const int MAX = int(1e9 + 5);
const ll MAXL = ll(1e18 + 5);
const ll MOD = ll(1e9 + 7);
const ll MOD2 = ll(998244353);

/* -------------------- Functions -------------------- */

void fastio() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

void precision(int x) {
    cout.setf(ios::fixed | ios::showpoint);
    cout.precision(x);
}

ll gcd(ll a, ll b) {
    while (b) {
        a %= b;
        swap(a, b);
    }
    return a;
}

ll lcm(ll a, ll b) {
    return a / gcd(a, b) * b;
}

ll range_sum(ll a, ll b) {
    ll dif = a - 1, cnt = b - a + 1;
    ll ans = ((b - a + 1) * (b - a + 2)) / 2;
    ans += ((b - a + 1) * dif);
    return ans;
}

string dec_to_bin(ll a) {
    string s = "";
    for (ll i = a; i > 0; ) {
        ll k = i % 2;
        i /= 2;
        char c = k + 48;
        s += c;
    }
    if (a == 0) {
        s = "0";
    }
    reverse(all(s));
    return s;
}

ll bin_to_dec(string s) {
    ll num = 0;
    for (int i = 0; i < s.size(); i++) {
        num *= 2ll;
        num += (s[i] - '0');
    }
    return num;
}

int isPrime(ll a) {
    if (a == 1) return 0;
    for (ll i = 2; i * i <= a; i++) {
        if (a % i == 0) return 0;
    }
    return 1;
}

ll binpow(ll a, ll b) {
    if (!a) return 0;
    ll ans = 1;
    while (b) {
        if (b & 1) {
            ans *= a;
        }
        b >>= 1;
        a *= a;
    }
    return ans;
}

ll binpow_by_mod(ll a, ll b, ll mod) {
    if (!a) return 0;
    ll ans = 1;
    while (b) {
        if (b & 1) {
            ans *= a;
            ans %= mod;
        }
        b >>= 1;
        a *= a;
        a %= mod;
    }
    return ans;
}

/* -------------------- Solution -------------------- */

const int N = 355;
int a[N], dp[N][N * N];

void slv() {
    int n, sum = 0;
    cin >> n;
    bool f = false;
    mii mp;
    for (int i = 1; i <= n; ++i) {
        cin >> a[i], sum += a[i];
        if (i > 1 && (a[i] % 2) != (a[i - 1] % 2)) f = true;
    }
    if (f || sum % 2) {
        cout << 0;
        return;
    }
    for (int i = 1; i <= n; ++i) {
        for (int j = sum; j >= 1; --j) {
            if (dp[0][j]) dp[0][j + a[i]] = 1;
        }
        dp[0][a[i]] = 1;
    }
    if (!dp[0][sum / 2]) {
        cout << 0;
        return;
    }
    for (int sk = 1; sk <= n; ++sk) {
        sum -= a[sk];
        for (int i = 1; i <= n; ++i) {
            if (i == sk) continue;
            for (int j = sum; j >= 1; --j) {
                if (dp[sk][j]) dp[sk][j + a[i]] = 1;
            }
            dp[sk][a[i]] = 1;
        }
        sum += a[sk];
    }
    for (int i = 1; i <= n; ++i) {
        sum -= a[i];
        for (int j = 1; j <= sum / 2; ++j) {
            if (dp[i][j]) mp[sum - 2 * j]++;
        }
        mp[sum]++;
        sum += a[i];
    }
    vi ans;
    for (auto elem : mp) {
        if (elem.ff == 0) continue;
        if (elem.ss == n) ans.pub(elem.ff);
    }
    cout << ans.size() << '\n';
    for (auto elem : ans) cout << elem << " ";
}

void cs() {
    int tstc = 1;
    //cin >> tstc;
    while (tstc--) {
        slv();
    }
}

void precalc() {
    return;
}

int main() {
    fastio();
    precalc();
    //precision(0);
    cs();
    return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'll range_sum(ll, ll)':
bootfall.cpp:90:21: warning: unused variable 'cnt' [-Wunused-variable]
   90 |     ll dif = a - 1, cnt = b - a + 1;
      |                     ^~~
bootfall.cpp: In function 'll bin_to_dec(std::string)':
bootfall.cpp:113:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  113 |     for (int i = 0; i < s.size(); i++) {
      |                     ~~^~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 15 / 15
• Subtask 4: 0 / 16
• Subtask 5: 0 / 21
• Subtask 6: 0 / 35