Submission #37843

#	Time	Username	Problem	Language	Result	Execution time	Memory
37843		Just_Solve_The_Problem	Bank (IZhO14_bank)	C++11	100 / 100	194 ms	1784 KiB

bank

#include <bits/stdc++.h>

using namespace std;

#define pb push_back

const int N = (int)22;
const int NN = (1 << 20);

int a[N], b[N];
bool used[NN];
int n, m;
vector < int > vec[N];

void go (int pos, int mask) {
    if (used[mask]) return ;
    used[mask] = 1;
    if (pos == n) {
        puts("YES");
        exit(0);
    }
    for (int to : vec[pos]) {
        if (mask & to) continue;
        go(pos + 1, mask | to);
    }
}

main () {
    scanf ("%d %d", &n, &m);
    for (int i = 0; i < n; i++) {
        scanf ("%d", a + i);
    }
    for (int i = 0; i < m; i++) {
        scanf ("%d", b + i);
    }
    for (int mask = 0; mask < (1 << m); mask++) {
        int sum = 0;
        for (int j = 0; j < m; j++) {
            if (mask & (1 << j)) {
                sum += b[j];
            }
        }
        for (int j = 0; j < n; j++) {
            if (sum == a[j]) {
                vec[j].pb(mask);
            }
        }
    }
    go(0, 0);
    puts("NO");
}

Compilation message (stderr)

bank.cpp:28:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main () {
       ^
bank.cpp: In function 'int main()':
bank.cpp:29:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf ("%d %d", &n, &m);
     ~~~~~~^~~~~~~~~~~~~~~~~
bank.cpp:31:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf ("%d", a + i);
         ~~~~~~^~~~~~~~~~~~~
bank.cpp:34:15: 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: 29 / 29