Submission #1086723

#TimeUsernameProblemLanguageResultExecution timeMemory
1086723hahahahaTrains (BOI24_trains)C++17
42 / 100
194 ms127312 KiB
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#define i64 long long #define ld long double #define bit(n,i) ((n>>i)&1) #define pii pair<int,int> #define sz(x) (int)x.size() #define FOR(i,a,b) for(int i=a; i<=b; i++) #define FOD(i,a,b) for(int i=a; i>=b; i--) #define fi first #define se second #define pb push_back #define all(x) x.begin(),x.end() #define __sumairu__ signed main() #define die_hard_onimai_fan void seggs() #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);} #define brute(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".ans","w",stdout);} #define TIME (1.0*clock()/CLOCKS_PER_SEC) #define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0); #define ai(n) array<int,n> #define dbg(x) {cerr<<#x<<' '<<x<<endl;} #define dbgArr(arr,n) {cerr<<#arr;FOR(_i,1,n)cerr<<' '<<(arr)[_i];cerr<<endl;} template <typename T,typename U> ostream& operator<<(ostream &os,pair<T,U>p){ return os<<"{"<<p.fi<<", "<<p.se<<"}"; } mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count()); i64 Rand(i64 l,i64 r) { i64 ans=l+1ll*rd()*rd()%(r-l+1); assert(l<=ans&&ans<=r); return ans; } //const i64 base=1e9+7; //const i64 mod=(1ll<<53)+5; #define i64 long long #define debug 0 const int mod=1e9+7; //const int mod=998244353; const int inf=1e9; ///check the limits, dummy const int N=1e5+5; int pre[N][320]; int dp[N]; int n; die_hard_onimai_fan { cin>>n; int S=sqrt(n); int ans=0; dp[1]=1; FOR(i,1,n) { int d,x; cin>>d>>x; FOR(j,1,min(S,i-1)) { (pre[i][j]+=pre[i-j][j])%=mod; (dp[i]+=pre[i][j])%=mod; } if(d!=0) { if(d>S) { int lim=(int)min(1ll*n,1ll*i+1ll*d*x); for(int j=i+d;j<=lim;j+=d)(dp[j]+=dp[i])%=mod; } else { int lim=(int)min(1ll*n,1ll*i+1ll*d*x); (pre[i+d][d]+=dp[i])%=mod; if(lim+d<=n)(pre[lim+d][d]-=dp[i])%=mod; } } (ans+=dp[i])%=mod; } cout<<ans; } __sumairu__ { FAST file(""); int tt=1;//cin>>tt; while(tt--)seggs(); cerr<<"\nTime elapsed: "<<TIME<<" s.\n"; } /** 5 1 3 2 1 1 3 0 10 3 5 */

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:59:53: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 | #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:135:5: note: in expansion of macro 'file'
  135 |     file("");
      |     ^~~~
Main.cpp:59:83: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 | #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
      |                                                                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:135:5: note: in expansion of macro 'file'
  135 |     file("");
      |     ^~~~
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