Submission #1118546

#	Time	Username	Problem	Language	Result	Execution time	Memory
1118546		KasymK	Bootfall (IZhO17_bootfall)	C++17	28 / 100	1048 ms	66956 KiB

bootfall

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N = 355;
int v[N];
bool is[N*N];
set<int> x[N];

int main(){
    // freopen("file.txt", "r", stdin);
    int n, sm = 0, copy;
    scanf("%d", &n);
    for(int i = 1; i <= n; ++i)
        scanf("%d", v+i), sm += v[i];
    vector<bool> odp(sm+1, false);
    odp[0] = 1;
    for(int i = 1; i <= n; ++i)
        for(int j = sm; j >= v[i]; --j)
            if(odp[j-v[i]])
                odp[j] = 1;
    if(sm&1 or !odp[sm/2]){
        puts("0");
        return 0;
    }
    for(int i = 0; i <= sm; ++i)
        is[i] = 1;
    copy = sm;
    // 3
    // 2 2 2
    for(int ad = 1; ad <= n; ++ad){
        sm -= v[ad];
        vector<bool> dp(sm+1, false);
        dp[0] = 1;
        for(int i = 1; i <= n; ++i)
            if(i!=ad)
                for(int j = sm; j >= v[i]; --j)
                    if(dp[j-v[i]])
                        dp[j] = 1;
        // for(int i = 0; i <= sm; ++i)
        //     if(dp[i])
        //         printf("%d ", i);
        // puts("");
        // wr;
        for(int i = 0; i <= sm; ++i)
            if(dp[i])
                x[ad].insert(abs(sm-2*i));
        sm = copy;
    }
    // for(int i = 1; i <= n; ++i){
    //     for(auto to : x[i])
    //         printf("%d ", to);
    //     if(!x[i].empty())
    //         puts("");
    // }
    // wr;
    // return 0;
    for(int ad = 1; ad <= n; ++ad)
        for(int i = 0; i <= sm; ++i){
            if(!is[i])
                continue;
            if(!x[ad].count(i))
                is[i] = 0;
        }
    vector<int> ans;
    for(int i = 0; i <= sm; ++i)
        if(is[i])
            ans.pb(i);
    printf("%d\n", (int)ans.size());
    for(auto i : ans)
        printf("%d ", i);
    puts("");
    return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:23:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
bootfall.cpp:25:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |         scanf("%d", v+i), sm += v[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