Submission #263628

#	Time	Username	Problem	Language	Result	Execution time	Memory
263628		Nucleist	Linear Garden (IOI08_linear_garden)	C++14	75 / 100	458 ms	65540 KiB

linear_garden

//Self-control leads to consistency.
#include <bits/stdc++.h> 
using namespace std; 
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#define flash ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define debug(x) cerr << " - " << #x << ": " << x << endl;
#define debugs(x, y) cerr << " - " << #x << ": " << x << " " << #y << ": " << y << endl;
#define all(x) (x).begin(),(x).end()
#define sz(x) (ll)x.size()
#define ll int
#define INF 1000000000
#define MOD 1000000007
#define pb push_back
#define ve vector<ll>
#define dos pair<ll,ll>
#define vedos vector<dos>
#define rand mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#define EPS 0.000001
struct greateri
{
    template<class T>
    bool operator()(T const &a, T const &b) const { return a > b; }
};
void setIO(string s) {
  ios_base::sync_with_stdio(0); cin.tie(0); 
  freopen((s+".in").c_str(),"r",stdin);
  freopen((s+".out").c_str(),"w",stdout);
}
int n,m;
map<pair<dos,dos>,int>dp;
ve hed;
int ans=0,ans1;
int solve(int index,int high,int low,int cur){
  int ans=0;
  if(index==n-1)return 1;
  if(dp.find({{index,high},{low,cur}})!=dp.end())return dp[{{index,high},{low,cur}}];
  if(abs(cur-high+1)<=2 && abs(cur-low+1)<=2 && abs(cur+1)<=2){
    int sol=cur+1;
    ans=(ans+solve(index+1,max(high,sol),min(low,sol),sol))%m;
  }
  if(abs(cur-high-1)<=2 && abs(cur-low-1)<=2 && abs(cur-1)<=2){
    int sol=cur-1;
    ans=(ans+solve(index+1,max(high,sol),min(low,sol),sol))%m;
  }
  return dp[{{index,high},{low,cur}}]=ans;
} 
int main()
{
  //flash;
  cin>>n;
  cin>>m;
  string in;
  cin>>in;
  int dif=0;
  int low=0;
  int high=0;
  int rank=0;
  for (int i = 0; i < sz(in); ++i)
  {
    if(in[i]=='P' && abs(dif-high+1)<=2 && abs(dif-low+1)<=2 && abs(dif+1)<=2){
      rank=(rank+solve(i,max(high,dif+1),min(low,dif+1),dif+1))%m;
    }
    if(in[i]=='L'){
      dif++;
      high=max(high,dif);
      low=min(low,dif);
    }
    else {
      dif--;
      low=min(low,dif);
      high=max(high,dif);
    }
  }
  cout<<(rank+1)%m;
  return 0;
}

Compilation message (stderr)

linear_garden.cpp:5: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    5 | #pragma GCC optimization ("O3")
      | 
linear_garden.cpp:6: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    6 | #pragma GCC optimization ("unroll-loops")
      | 
linear_garden.cpp: In function 'void setIO(std::string)':
linear_garden.cpp:28:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   28 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
linear_garden.cpp:29:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   29 |   freopen((s+".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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