Problem p02249 (C++) — buggy submission, verdict: Time Limit Exceeded

#ifdef debug
#include <chrono>
#endif

#include <algorithm> // next_permutation
#include <cmath>
#include <cstdio>
#include <cstring> //memcpy
#include <iomanip>
#include <iostream>
#include <list>
#include <numeric> //accumulate
#include <queue>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
// #include <map>
// #include <unordered_map> //hash func.
#include <fstream> //ifstream, ofstream

// #define NDEBUG //If NDEBUG is defined before #include <cassert>, assert will
// be ignored. You had better define NDEBUG when u submit the code.
#include <cassert> //assert

using namespace std;

#define dout cout
// If u wanna output to a text file instead of standard output, plz define
// OUTPUTFILE. #define OUTPUTFILE "output.txt"
// //*******************************************************************************************************************************************
#ifdef OUTPUTFILE
#define dout outputfile
ofstream outputfile(OUTPUTFILE);
#define OutputFilePath                                                         \\
  "/Users/Nag/Documents/Prgm/Test/DerivedData/Test/Build/Products/Debug/"      \\
  "output.txt"
#endif

#define din cin
// If u wanna input from a text file instead of standard input, plz define
// INPUTFROMTEXTFILE???. #define INPUTFILE "input.txt"
// //*******************************************************************************************************************************************
#ifdef INPUTFILE
#define din inputfile
ifstream inputfile(INPUTFILE);
#endif

#define scan(A) scanf("%d", &(A))
#define disp(A) dout << #A << " = " << setw(3) << (A) << endl
#define disP(A) dout << setw(3) << (A) << " "
#define rep(i, a, n) for (int(i) = (a); (i) < (n); (i)++)
#define dispAll(A, n)                                                          \\
  dout << #A << " = ";                                                         \\
  rep(j, 0, (n)) { disP(A[j]); }                                               \\
  dout << endl
// #define dispAll(A,n) cout << #A << " = "; rep(j, 0, (n)) {cout << setw(3) <<
// A[j] << " ";} cout << endl

#define sign(x) ((x) > 0) - ((x) < 0) // x<0: -1, x=0: 0, x>0: +1
#define p(i) (i) / 2
#define l(i) (i) * 2
#define r(i) (i) * 2 + 1

int dx[] = {
    1, -1, 0, 0, 1,
    1, -1, -1}; //???????????????????????????????¨??????????????????????????????????
int dy[] = {0, 0, -1, 1, -1, 1, 1, -1};

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef long long ll;
typedef unsigned long ull;

const int INF = (int)2e9 + 10;
const ll INF_LL = (ll)9e18 - 1LL; // Be careful for overflow.
const ull INF_ULL = (ull)1e19 - 1ULL;
const int NONE = -1;
const ll MOD =
    (ll)1e9 + 7; //??§???????´???°?????£??¨??¨????????°????????????10???7??????

const int N_MAX = 1001;   // num of vertex or element
const int M_MAX = 100000; // num of edge
const int DATA_MAX = 1000000010;

int N;

char T[N_MAX][N_MAX];
char P[N_MAX][N_MAX];
int H, W, R, C;

int Hash[N_MAX][N_MAX];
int Bpow[N_MAX][N_MAX];

int main() {

  // cin, cout????????????
  // ?????¨??????cin?????????????????¨??¨cin??§???scanf?????????????????¨??¨scanf??§??±?????????????????????
  cin.tie(0);                  // cin??¨cout??????????????????
  ios::sync_with_stdio(false); // iostream??¨stdio??????????????????

  // read input data
  scanf("%d %d", &H, &W);
  rep(i, 0, H) {
    rep(j, 0, W) { scanf(" %c", &T[i][j]); }
  }

  scanf("%d %d", &R, &C);

  rep(i, 0, R) {
    rep(j, 0, C) { scanf(" %c", &P[i][j]); }
  }

#ifdef debug
  rep(i, 0, H) {
    rep(j, 0, W) { dout << T[i][j] << " "; }
    dout << endl;
  }
  dout << endl;

  din >> R >> C;
  rep(i, 0, R) {
    rep(j, 0, C) { dout << P[i][j] << " "; }
    dout << endl;
  }
  dout << endl;

#endif

  //------------------------------------------------------------------------------------------
#ifdef debug
  // start timer
  auto startTime = chrono::system_clock::now();
#endif
  //------------------------------------------------------------------------------------------

#ifdef debug
  // calc.
  bool found;
  rep(i, 0, H - R + 1) {
    rep(j, 0, W - C + 1) {
      found = true;
      rep(ii, 0, R) {
        rep(jj, 0, C) {
          if (T[i + ii][j + jj] != P[ii][jj]) {
            found = false;
            ii = R;
            jj = C;
          }
        }
      }

      if (found) {
        printf("%d %d\\n", i, j);
      }
    }
  }

  dout << "============================================\\n";
#endif

  // calc.
  const int B = 10007;
  int t = 1;

  for (int i = R - 1; i >= 0; i--) {
    for (int j = C - 1; j >= 0; j--) {
      Bpow[i][j] = t;
      t *= B;
    }
  }

#ifdef debug
  dout << "Bpow[][] = \\n";
  rep(i, 0, R) {
    rep(j, 0, C) { dout << Bpow[i][j] << " "; }
    dout << endl;
  }
#endif

  int HashP = 0;
  rep(i, 0, R) {
    rep(j, 0, C) { HashP += P[i][j] * Bpow[i][j]; }
  }

#ifdef debug
  disp(HashP);
#endif

  int HashT = 0;
  rep(i, 0, R) {
    rep(j, 0, C) { HashT += T[i][j] * Bpow[i][j]; }
  }

#ifdef debug
  disp(HashT);
#endif

  // search
  rep(i, 0, H - R + 1) {
    rep(j, 0, W - C + 1) {

      Hash[i][j] = HashT;

#ifdef debug
      dout << "-------------------------\\n";
      dout << i << " " << j << endl;
      disp(HashT);
      disp(HashP);

      dout << "Hash[][] = \\n";
      rep(i, 0, H) {
        rep(j, 0, W) { dout << Hash[i][j] << " "; }
        dout << endl;
      }
#endif

      if (HashT == HashP) {
        printf("%d %d\\n", i, j);
#ifdef debug
        dout << "//////////////////////////////////////////////////////////////"
                "\\n";
#endif
      }

      if (j + C < W) {
        HashT *= B;
        rep(k, i, i + R) {
          HashT -= T[k][j] * Bpow[k - i][0] * B;
          HashT += T[k][j + C] * Bpow[k - i][C - 1];
        }
      } else if (i + R < H) { // j+C = W ????????? j=W-C
                              // ???????????????j??????????????°???????????´???
        HashT = Hash[i][0] * Bpow[R - 1][0] * B;
        rep(k, 0, C) {
          HashT -= T[i][k] * Bpow[0][k] * Bpow[R - 1][0] * B;
          HashT += T[i + R][k] * Bpow[R - 1][k];
        }
      }
    }
  }

  //------------------------------------------------------------------------------------------
#ifdef debug
  // stop timer
  auto endTime = chrono::system_clock::now();
  auto dur = endTime - startTime;
  auto msec = chrono::duration_cast<chrono::milliseconds>(dur).count();
  dout << fixed << setprecision(4) << (double)msec / 1000 << " sec \\n";
#endif
  //------------------------------------------------------------------------------------------

#ifdef INPUTFILE
  inputfile.close();
#endif

#ifdef OUTPUTFILE
  outputfile.close();
  cout << "\\"" << OutputFilePath << "\\"" << endl;
#endif

  return 0;
}

Error: TLE

Fixed submission:

// #define debug
// //*******************************************************************************************************************************************
#ifdef debug
#include <chrono>
#endif

#include <algorithm> // next_permutation
#include <cmath>
#include <cstdio>
#include <cstring> //memcpy
#include <iomanip>
#include <iostream>
#include <list>
#include <numeric> //accumulate
#include <queue>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
// #include <map>
// #include <unordered_map> //hash func.
#include <fstream> //ifstream, ofstream

// #define NDEBUG //If NDEBUG is defined before #include <cassert>, assert will
// be ignored. You had better define NDEBUG when u submit the code.
#include <cassert> //assert

using namespace std;

#define dout cout
// If u wanna output to a text file instead of standard output, plz define
// OUTPUTFILE. #define OUTPUTFILE "output.txt"
// //*******************************************************************************************************************************************
#ifdef OUTPUTFILE
#define dout outputfile
ofstream outputfile(OUTPUTFILE);
#define OutputFilePath                                                         \\
  "/Users/Nag/Documents/Prgm/Test/DerivedData/Test/Build/Products/Debug/"      \\
  "output.txt"
#endif

#define din cin
// If u wanna input from a text file instead of standard input, plz define
// INPUTFROMTEXTFILE???. #define INPUTFILE "input.txt"
// //*******************************************************************************************************************************************
#ifdef INPUTFILE
#define din inputfile
ifstream inputfile(INPUTFILE);
#endif

#define scan(A) scanf("%d", &(A))
#define disp(A) dout << #A << " = " << setw(3) << (A) << endl
#define disP(A) dout << setw(3) << (A) << " "
#define rep(i, a, n) for (int(i) = (a); (i) < (n); (i)++)
#define dispAll(A, n)                                                          \\
  dout << #A << " = ";                                                         \\
  rep(j, 0, (n)) { disP(A[j]); }                                               \\
  dout << endl
// #define dispAll(A,n) cout << #A << " = "; rep(j, 0, (n)) {cout << setw(3) <<
// A[j] << " ";} cout << endl

#define sign(x) ((x) > 0) - ((x) < 0) // x<0: -1, x=0: 0, x>0: +1
#define p(i) (i) / 2
#define l(i) (i) * 2
#define r(i) (i) * 2 + 1

int dx[] = {
    1, -1, 0, 0, 1,
    1, -1, -1}; //???????????????????????????????¨??????????????????????????????????
int dy[] = {0, 0, -1, 1, -1, 1, 1, -1};

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef long long ll;
typedef unsigned long ull;

const int INF = (int)2e9 + 10;
const ll INF_LL = (ll)9e18 - 1LL; // Be careful for overflow.
const ull INF_ULL = (ull)1e19 - 1ULL;
const int NONE = -1;
const ll MOD =
    1e9 + 7; //??§???????´???°?????£??¨??¨????????°????????????10???7??????

const int N_MAX = 1001;   // num of vertex or element
const int M_MAX = 100000; // num of edge
const int DATA_MAX = 1000000010;

int N;

char T[N_MAX][N_MAX];
char P[N_MAX][N_MAX];
int H, W, R, C;

int main() {
  //------------------------------------------------------------------------------------------
#ifdef debug
  // start timer
  auto startTime = chrono::system_clock::now();
#endif
  //------------------------------------------------------------------------------------------

  // cin, cout????????????
  // ?????¨??????cin?????????????????¨??¨cin??§???scanf?????????????????¨??¨scanf??§??±?????????????????????
  cin.tie(0);                  // cin??¨cout??????????????????
  ios::sync_with_stdio(false); // iostream??¨stdio??????????????????

  // read input data
  scanf("%d%d", &H, &W);
  rep(i, 0, H) {
    rep(j, 0, W) { scanf(" %c", &T[i][j]); }
  }

  scanf("%d%d", &R, &C);

  rep(i, 0, R) {
    rep(j, 0, C) { scanf(" %c", &P[i][j]); }
  }

#ifdef debug
  rep(i, 0, H) {
    rep(j, 0, W) { dout << T[i][j] << " "; }
    dout << endl;
  }
  dout << endl;

  din >> R >> C;
  rep(i, 0, R) {
    rep(j, 0, C) { dout << P[i][j] << " "; }
    dout << endl;
  }
  dout << endl;

#endif

  // calc.
  bool found;
  rep(i, 0, H - R + 1) {
    rep(j, 0, W - C + 1) {
      found = true;
      rep(ii, 0, R) {
        rep(jj, 0, C) {
          if (T[i + ii][j + jj] != P[ii][jj]) {
            found = false;
            ii = R;
            jj = C;
          }
        }
      }

      if (found) {
        printf("%d %d\\n", i, j);
      }

#ifdef debug
      dout << "--------------\\n";
      disp(i);
      disp(j);
      disp(found);
#endif
    }
  }

  //------------------------------------------------------------------------------------------
#ifdef debug
  // stop timer
  auto endTime = chrono::system_clock::now();
  auto dur = endTime - startTime;
  auto msec = chrono::duration_cast<chrono::milliseconds>(dur).count();
  dout << fixed << setprecision(4) << (double)msec / 1000 << " sec \\n";
#endif
  //------------------------------------------------------------------------------------------

#ifdef INPUTFILE
  inputfile.close();
#endif

#ifdef OUTPUTFILE
  outputfile.close();
  cout << "\\"" << OutputFilePath << "\\"" << endl;
#endif

  return 0;
}