Submission #1152049

#	Time	Username	Problem	Language	Result	Execution time	Memory
1152049		sasde	Linear Garden (IOI08_linear_garden)	C++20	100 / 100	246 ms	9232 KiB

linear_garden

#include<bits/stdc++.h>
#define str string
#define task "strdel"
#define int long long
#define ii pair<int,int>
#define iii pair<int,ii>
#define iv pair<ii,ii>
#define se second
#define fi first
#define ffi fi.fi
#define sfi se.fi
#define sse se.se
#define fse fi.se
#define lt(i, c, d) for(int i = c; i <= d; ++i)
#define fl(i, c, d) for(int i = d; i >= c; --i)
#define pb push_back
#define emb emplace_back
#define emf emplace_front
#define em emplace
using namespace std;
const int N=1e6+5,lg=20;
int mod=1e9+7;
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int Rand(int u,int v){
 return u+rd()%(v-u+1);
}
int n,f[2][5][5][5][2],k,a[N];
string s;

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

void solve(){
  cin >> n >> mod >> s;
  s=" "+s;
  for(int i=1;i<=n;++i){
    a[i]=(s[i]=='P');
  }
    memset(f, 0, sizeof f);

  f[0][2][2][2][0]=1;
  for(int i=0;i<n;++i){
       memset(f[(i+1)%2],0,sizeof f[(i+1)%2]);
     for(int cnt=0;cnt<=4;++cnt){
        for(int maxx=2;maxx<=4;++maxx){
          for(int minn=0;minn<=2;++minn){
            for(int ok=0;ok<=1;++ok)
          {
  int cnt1=cnt+1;
  int maxx1=max(maxx,cnt1);
  int minn1=min(minn,cnt1);

   if(maxx1-minn1<=2&&(ok||a[i+1]>=1))
  add(f[(i+1)%2][cnt1][maxx1][minn1][ok],f[i%2][cnt][maxx][minn][ok]);
    cnt1=cnt-1;
   maxx1=max(maxx,cnt1);
   minn1=min(minn,cnt1);
  if(maxx1-minn1<=2)
  add(f[(i+1)%2][cnt1][maxx1][minn1][ok||a[i+1]],f[i%2][cnt][maxx][minn][ok]);
          }
          }
        }
     }
      
  }
  
  int ans=0;
  for(int cnt=0;cnt<=4;++cnt){
     for(int maxx=2;maxx<=4;++maxx){
      for(int minn=0;minn<=2;++minn){
        for(int ok=0;ok<=1;++ok)
        if(maxx-minn<=2)add(ans,f[n%2][cnt][maxx][minn][ok]);
      }
     }
  }
  cout <<ans;

}
main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    if(fopen(task".inp","r")){
      freopen(task".inp","r",stdin);
      freopen(task".out","w",stdout);
    }
    int t=1;
 //   cin >> t;
while(t--){
    solve();
    cout<<'\n';
}

}

Compilation message (stderr)

linear_garden.cpp:81:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   81 | main()
      | ^~~~
linear_garden.cpp: In function 'int main()':
linear_garden.cpp:87:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |       freopen(task".inp","r",stdin);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
linear_garden.cpp:88:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |       freopen(task".out","w",stdout);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 2 / 2
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 4 / 4
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