Submission #90950

#	Time	Username	Problem	Language	Result	Execution time	Memory
90950		inom	Bank (IZhO14_bank)	C++14	71 / 100	1073 ms	8184 KiB

bank

#include<bits/stdc++.h>
#include<ext/pb_ds/tree_policy.hpp>
#include<ext/pb_ds/assoc_container.hpp>
 
#define fi first
#define se second
#define new new228
#define pb push_back
#define rank rank228
#define sz(c) (int)(c).size()
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
 
using namespace std;
using namespace __gnu_pbds;
 
#pragma GCC optimize("Ofast")
#pragma GCC optimize("no-stack-protector")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,popcnt,abm,mmx,tune=native")
#pragma GCC optimize("fast-math")
#pragma warning(disable : 4996)
 
typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set; // st.oreder_of_key();
 
const int N = 25;
const int INF = 1e15;
const int MAXN = 4 * N;
const int MOD = 998244353;
 
int TN = 1;
 
int n, m;
bool us[N];
int a[N], b[N];
map<int, vector<int> > v;

void printbin(int x) {
    while (x) {
        printf("%d", x % 2);
        x /= 2;
    }
}

void rec(int pos, int mask) {
    /*
    printf("rec(%d, ", pos);
    printbin(mask);
    printf(")\n");
    */
    if (pos == n + 1) {
        printf("YES\n");
        exit(0);
    }

    for (int i = 0; i < v[a[pos]].size(); i++) {
        int cur = v[a[pos]][i];
        if ((mask & cur) == cur) {
            rec(pos + 1, mask ^ cur);
        }
    }
}

signed main() {
    scanf("%d %d", &n, &m);
    for (int i = 1; i <= n; i++) {
        scanf("%d", &a[i]);
    }
    for (int i = 0; i < m; i++) {
        scanf("%d", &b[i]);
    }

    for (int mask = 1; mask < (1 << m); mask++) {
        int sum = 0;
        for (int j = 0; j < m; j++) {
            if (mask & (1 << j))
                sum += b[j];
        }
        v[sum].pb(mask);
    }
    /*
    for (int i = 1; i <= n; i++) {
        printf("%d : ", a[i]);
        for (int j = 0; j < v[a[i]].size(); j++) {
            int tmp = v[a[i]][j];
            printbin(tmp);
            printf(" ");
        }
        printf("\n");
    }
    */
    rec(1, (1 << m) - 1);
    puts("NO");
    return 0;
}

Compilation message (stderr)

bank.cpp:22:0: warning: ignoring #pragma warning  [-Wunknown-pragmas]
 #pragma warning(disable : 4996)
 
bank.cpp:27:17: warning: overflow in implicit constant conversion [-Woverflow]
 const int INF = 1e15;
                 ^~~~
bank.cpp: In function 'void rec(int, int)':
bank.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < v[a[pos]].size(); i++) {
                     ~~^~~~~~~~~~~~~~~~~~
bank.cpp: In function 'int main()':
bank.cpp:65:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
bank.cpp:67:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a[i]);
         ~~~~~^~~~~~~~~~~~~
bank.cpp:70:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &b[i]);
         ~~~~~^~~~~~~~~~~~~

• Subtask 1: 19 / 19
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 0 / 29