Problem p02248 (C++) — buggy submission, verdict: Time Limit Exceeded

// #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 = 2e9 + 10;
const ll INF_LL = 9e18; // Be careful for overflow.
const ll INF_ULL = 1e19;
const int NONE = -1;
const ll MOD = 1e9 + 7;

const int N_MAX = 51;     // num of vertex or element
const int M_MAX = 100000; // num of edge
const int DATA_MAX = 1000000010;

int N;

string T, P;

void display() {

  dout << "----\\n";
  rep(i, 0, N) {
    disP(i);
    dout << " = " << endl;
  }
  dout << "----\\n";
  dout << "----\\n";
}

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
  din >> T >> P;

  int TL = T.size();
  int PL = P.size();

  // calc.
  const ull B = 100000007;
  ull t = 1;
  rep(i, 1, PL) t *= B;

  ull TH = 0, PH = 0;
  rep(i, 0, PL) TH = TH * B + T[i];
  rep(i, 0, PL) PH = PH * B + P[i];

  rep(i, 0, TL - PL + 1) {
#ifdef debug
    dout << "-------------\\n";
    disp(i);
    disp(TH);
    disp(PH);
#endif
    if (TH == PH) {
      dout << i << endl;
    }

    if (i + PL < TL)
      TH = (TH - T[i] * t) * B + T[i + PL];
  }

#ifdef debug
  display();
  string subT;
  rep(i, 0, TL - PL + 1) {
    subT = T.substr(i, PL);

    if (P == subT) {
      dout << i << endl;
    }
  }
#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;
}

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 = 2e9 + 10;
const ll INF_LL = 9e18; // Be careful for overflow.
const ll INF_ULL = 1e19;
const int NONE = -1;
const ll MOD = 1e9 + 7;

const int N_MAX = 51;     // num of vertex or element
const int M_MAX = 100000; // num of edge
const int DATA_MAX = 1000000010;

int N;

string T, P;

void display() {

  dout << "----\\n";
  rep(i, 0, N) {
    disP(i);
    dout << " = " << endl;
  }
  dout << "----\\n";
  dout << "----\\n";
}

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
  din >> T >> P;

  int TL = T.size();
  int PL = P.size();

  // calc.
  string subT;
  rep(i, 0, TL - PL + 1) {
    subT = T.substr(i, PL);

    if (P == subT) {
      dout << i << endl;
    }
  }

#ifdef debug
  display();
#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;
}