Submission #204995

#	Time	Username	Problem	Language	Result	Execution time	Memory
204995		Haunted_Cpp	Shell (info1cup18_shell)	C++17	55 / 100	1050 ms	26488 KiB

shell

#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <stack>
#include <algorithm>
#include <cstring>
#include <cassert>
#include <bitset>
using namespace std;
 
#define FOR(i, a, b) for (int i = a; i < (int) b; i++)
#define F0R(i, a) FOR(i, 0, a)
#define ROF(i, a, b) for (int i = a; i >= (int) b; i--)
#define R0F(i, a) ROF(i, a, 0)
#define GO(i, a) for (auto i : a)
 
#define f first
#define s second
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
 
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
typedef vector<vi> vvi;
typedef vector<vpii> vvpii;
typedef long long i64;
typedef vector<i64> vi64;
 
const int dr[] = {+1, -1, +0, +0, +1, -1, +1, -1};
const int dc[] = {+0, +0, +1, -1, +1, -1, -1, +1};
const int ms[] = {+31, +29, +31, 30, +31, +30, +31, +31, +30, +31, +30, +31};

void setIO(string nome) {
  ios_base::sync_with_stdio(0); cin.tie(0);
  freopen ((nome + ".in").c_str(), "r", stdin);
  freopen ((nome + ".out").c_str(), "w", stdout);
}

const int N = 1500 + 5;
const int M = 1500 + 5;
const int MOD = 1e9 + 7;

int n, m, k, streak [N];
int dp [N][M];
vvi g (N);

void add (int &a, int b) {
  a += b;
  while (a >= MOD) a -= MOD;
}

int solve (int node, int match) {
  if (node == n - 1) return (match == k);
  int &res = dp[node][match];
  if (~res) return res;
  res = 0;
  int target = (match < k ? streak[match] : -1); 
  GO (to, g[node]) add (res, solve (to, match + (to == target)));
  return res;
} 

int main () {
  ios_base::sync_with_stdio(0); 
  cin.tie(0);
  cin >> n >> m >> k;
  memset (dp, -1, sizeof(dp));
  F0R (i, k) {
    cin >> streak[i];
    --streak[i];
  }
  F0R (i, m) {
    int st, et;
    cin >> st >> et;
    --st; --et;
    g[st].eb(et);
  } 
  cout << solve (0, streak[0] == 0 ? 1 : 0) << '\n';
  return 0;
}

Compilation message (stderr)

shell.cpp: In function 'void setIO(std::__cxx11::string)':
shell.cpp:39:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen ((nome + ".in").c_str(), "r", stdin);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
shell.cpp:40:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen ((nome + ".out").c_str(), "w", stdout);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 45 / 45
• Subtask 3: 0 / 20
• Subtask 4: 0 / 25