Problem p00258 (C++)

Buggy submission (status: Time Limit Exceeded):
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>

#include <algorithm>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>

#include <cassert>
#include <functional>

typedef long long ll;
using namespace std;

#define debug(x) cerr << #x << " = " << x << endl;

#define mod 1000000007              // 1e9+7(prime number)
#define INF 1000000000              // 1e9
#define LLINF 2000000000000000000LL // 2e18
#define SIZE 35

int dp[SIZE][1 << 16];

void calc(int n) {
  int c;
  int in;
  int a[SIZE] = {}, b[SIZE] = {};

  scanf("%d", &c);

  for (int i = 0; i < n; i++) {

    for (int j = 0; j < 16; j++) {
      scanf("%d", &in);
      a[i] = a[i] * 2 + in;
    }
  }

  for (int i = 0; i < c; i++) {

    for (int j = 0; j < 16; j++) {
      scanf("%d", &in);
      b[i] = b[i] * 2 + in;
    }
  }

  for (int i = 0; i <= n; i++) {
    for (int j = 0; j < (1 << 16); j++) {
      dp[i][j] = -INF;
    }
  }

  dp[0][0] = 0;

  for (int i = 0; i < n; i++) {
    for (int j = 0; j < (1 << 16); j++) {

      int now = j | a[i];

      for (int k = 0; k < c; k++) {
        int p = __builtin_popcount(now & b[k]);

        dp[i + 1][now & (~(now & b[k]))] =
            max(dp[i + 1][now & (~(now & b[k]))], dp[i][j] + p);
      }

      dp[i + 1][now] = max(dp[i][j], dp[i + 1][now]);
    }
  }

  int ans = 0;

  for (int i = 0; i < (1 << 16); i++) {
    ans = max(ans, dp[n][i]);
  }

  printf("%d\n", ans);
}

int main() {
  int n;

  while (scanf("%d", &n) != EOF) {
    if (n == 0)
      break;
    calc(n);
  }

  return 0;
}

Fixed submission:
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>

#include <algorithm>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>

#include <cassert>
#include <functional>

typedef long long ll;
using namespace std;

#define debug(x) cerr << #x << " = " << x << endl;

#define mod 1000000007              // 1e9+7(prime number)
#define INF 1000000000              // 1e9
#define LLINF 2000000000000000000LL // 2e18
#define SIZE 35

int dp[SIZE][1 << 16];

void calc(int n) {
  int c;
  int in;
  int a[SIZE] = {}, b[SIZE] = {};

  scanf("%d", &c);

  for (int i = 0; i < n; i++) {

    for (int j = 0; j < 16; j++) {
      scanf("%d", &in);
      a[i] = a[i] * 2 + in;
    }
  }

  for (int i = 0; i < c; i++) {

    for (int j = 0; j < 16; j++) {
      scanf("%d", &in);
      b[i] = b[i] * 2 + in;
    }
  }

  for (int i = 0; i <= n; i++) {
    for (int j = 0; j < (1 << 16); j++) {
      dp[i][j] = -INF;
    }
  }

  dp[0][0] = 0;

  for (int i = 0; i < n; i++) {
    for (int j = 0; j < (1 << 16); j++) {
      if (dp[i][j] == -INF)
        continue;

      int now = j | a[i];

      for (int k = 0; k < c; k++) {
        int p = __builtin_popcount(now & b[k]);

        dp[i + 1][now & (~(now & b[k]))] =
            max(dp[i + 1][now & (~(now & b[k]))], dp[i][j] + p);
      }

      dp[i + 1][now] = max(dp[i][j], dp[i + 1][now]);
    }
  }

  int ans = 0;

  for (int i = 0; i < (1 << 16); i++) {
    ans = max(ans, dp[n][i]);
  }

  printf("%d\n", ans);
}

int main() {
  int n;

  while (scanf("%d", &n) != EOF) {
    if (n == 0)
      break;
    calc(n);
  }

  return 0;
}