Submission #3773059

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

const int N = 2005;
const int K = 10005;

int n, k;
char s[N][K];
int len[N];
bitset<K> dp[N];
pair<int, int> v[2][K];
int nv, tnv;

int main() {
  scanf("%d %d", &n, &k);
  for (int i = 1; i <= n; i++) {
    scanf("%s", s[i]);
    len[i] = strlen(s[i]);
  }
  dp[n + 1][0] = 1;
  for (int i = n; i > 0; i--) {
    dp[i] = dp[i + 1] | (dp[i + 1] << len[i]);
  }
  for (int i = 1; i <= n; i++) {
    if (dp[i + 1][k - len[i]]) {
      v[0][nv++]= make_pair(i, 0);
    }
  }
  for (int iter = 1,i = 1; iter <= k; iter++, i ^= 1) {
    tnv = 0;
    char c = 'z';
    for (int j = 0; j < nv; j++) {
      c = min(c, s[v[i ^ 1][j].first][v[i ^ 1][j].second]);
    }
    putchar(c);
    int bid = n + 1;
    for (int j = 0; j < nv; j++) {
      int id = v[i ^ 1][j].first;
      int pos = v[i ^ 1][j].second;
      if (s[id][pos] != c) {
        continue;
      }
      if (pos < len[id] - 1)
        v[i][tnv++] = make_pair(id, pos+1);
      else {
        bid = min(bid, id);
      }
    }
    for (int j = bid + 1; j <= n; j++) {
      if (k - iter - len[j] >= 0 && dp[j + 1][k - iter - len[j]]) {
        v[i][tnv++] = make_pair(j, 0);
      }
    }
    nv = tnv;
  }
  putchar('\n');
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:16:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &n, &k);
                         ^
./Main.cpp:18:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s", s[i]);
                      ^

Judge Result