제출 #316416

#제출 시각아이디문제언어결과실행 시간메모리
316416vipghn2003Skyscraper (JOI16_skyscraper)C++14
컴파일 에러
0 ms0 KiB
#include<bits/stdc++.h> #define int long long using namespace std; const int N=105; const int mod=1e9+7; int n,L,a[N],b[N]; int dp[N][N][2][2][N*10]; int calc(int i,int cnt,bool haveL,bool haveR,int val) { if(i) val+=a[i-1]*(2*cnt-haveL-haveR); if(val>L) return 0; int &res=dp[i][cnt][haveL][haveR][val]; if(res!=-1) return res; if(i==n) { if(val>L||cnt!=1||!haveL||!haveR) return 0; return 1; } res=0; ///new comp (res+=calc(i+1,cnt+1,haveL,haveR,val)*(cnt+1-haveL-haveR)%mod)%=mod; ///new L if(!haveL) (res+=calc(i+1,cnt+1,1,haveR,val))%=mod; ///new R if(!haveR) (res+=calc(i+1,cnt+1,haveL,1,val))%=mod; if(cnt) { ///merge if(cnt>=2) (res+=calc(i+1,cnt-1,haveL,haveR,val)*(cnt-1)%mod)%=mod; ///push front (res+=calc(i+1,cnt,haveL,haveR,val)*(cnt-haveL)%mod)%=mod; ///push back (res+=calc(i+1,cnt,haveL,haveR,val)*(cnt-haveR)%mod)%=mod; ///made L if(!haveL) (res+=calc(i+1,cnt,1,haveR,val)%=mod; ///made R if(!haveR) (res+=calc(i+1,cnt,haveL,1,val))%=mod; } //cout<<i<<' '<<cnt<<' '<<haveL<<' '<<haveR<<' '<<val<<'\n' ; return res; } main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); memset(dp,-1,sizeof dp); cin>>n>>L; if(n==1) return cout<<1,0; for(int i=0;i<n;i++) cin>>b[i]; sort(b,b+n); for(int i=0;i<n;i++) a[i]=b[i+1]-b[i]; cout<<calc(0,0,0,0,0); }

컴파일 시 표준 에러 (stderr) 메시지

skyscraper.cpp: In function 'long long int calc(long long int, long long int, bool, bool, long long int)':
skyscraper.cpp:38:52: error: lvalue required as left operand of assignment
   38 |        if(!haveL) (res+=calc(i+1,cnt,1,haveR,val)%=mod;
      |                                                    ^~~
skyscraper.cpp:38:55: error: expected ')' before ';' token
   38 |        if(!haveL) (res+=calc(i+1,cnt,1,haveR,val)%=mod;
      |                   ~                                   ^
      |                                                       )
skyscraper.cpp: At global scope:
skyscraper.cpp:46:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   46 | main()
      |      ^