Submission #1220849

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Source Code Expand

#include <cstdio>
#include <cstring>
#include <cassert>
#include <algorithm>
#include <iostream>
#include <vector>

using namespace std;

#define TRACE(x) cerr << #x << " = " << x << endl
#define REP(i, n) for (int i=0; i<n; i++)
#define FOR(i, a, b) for (int i=(a); i<(b); i++)
#define _ << " " <<

typedef long long ll;
typedef pair<int, int> P;
#define X first
#define Y second

const int MAX = 1<<20, ALFA = 26;

char poc[MAX], kraj[MAX];
int pozl[MAX][ALFA];
int pref[MAX];

void nope() {
  printf("-1\n");
  exit(0);
}

int main()
{
  int n;
  scanf("%d %s %s", &n, poc, kraj);
  
  memset(pozl, -1, sizeof pozl);

  REP(i, n) {
    if (i)
      memcpy(pozl[i], pozl[i-1], sizeof pozl[i]);
    pozl[i][poc[i]-'a'] = i;
  }
  
  int poz = n-1;
  int rje = 0, vr = 0;
  for (int i=n-1; i>=0; i--) {
    if (poz > i) {
      vr = 0;
      poz = i;
    }

    int tmp = pozl[poz][kraj[i]-'a'];
    if (tmp == -1) nope();

    if (tmp != poz) {
      vr++;
      rje = max(rje, vr);
    }
    poz = tmp;
  }  

  printf("%d\n", rje);

  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:34:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %s %s", &n, poc, kraj);
                                   ^

Judge Result