제출 #262785

#제출 시각아이디문제언어결과실행 시간메모리
262785TadijaSebezSpiral (BOI16_spiral)C++11
60 / 100
1 ms256 KiB
#include <bits/stdc++.h> using namespace std; #define ll long long const int mod=1e9+7; int add(int x,int y){x+=y;return x>=mod?x-mod:x;} int sub(int x,int y){x-=y;return x<0?x+mod:x;} int mul(int x,int y){return (ll)x*y%mod;} void ckadd(int&x,int y){x=add(x,y);} int GetCell(int x,int y){ int mx=max(abs(x),abs(y)); int ans=mul(2*mx-1,2*mx-1); if(y==mx)ckadd(ans,add(sub(mx,x),mul(mx,2))); else if(x==-mx)ckadd(ans,add(sub(mx,y),mul(mx,4))); else if(y==-mx)ckadd(ans,add(x,mul(mx,7))); else if(x==mx)ckadd(ans,add(y,mx)); return ans; } int sum0(int n){return n+1;} int sum1(int n){return mul(mul(n,n+1),(mod+1)/2);} int sum2(int n){return mul(mul(n,n+1),mul(2*n+1,mul((mod+1)/2,(mod+1)/3)));} int sum3(int n){return mul(sum1(n),sum1(n));} int GetSQ(int now,int dif,int n){ int T1=sum1(n); int T2=mul(2,sum2(n)); int T3=add(add(mul(now,sum0(n)),mul(dif,sum1(n))) ,mul(4,sub(sum2(n),sum1(n)))); int T4=mul(2,add(add(mul(now,sum1(n)),mul(dif,sum2(n))) ,mul(4,sub(sum3(n),sum2(n))))); return add(add(T1,T2),add(T3,T4)); } int GetST(int now,int nxt,int len,int n){ int dif=nxt-now; int T1=add(mul(now,sum0(n-1)),mul(dif,sum1(n-1))); int T2=mul(4,sub(sum2(n-1),sum1(n-1))); int T3=mul(n,sum1(len-1)); return add(mul(len,add(T1,T2)),T3); } int Ari(int now,int dif,int n){ return add(mul(now,sum0(n)),add(mul(dif,sum1(n)),mul(4,sub(sum2(n),sum1(n))))); } int Get(int x,int y){ int n=min(abs(x),abs(y)),ans; if(x>=0&&y>=0){ ans=GetSQ(1,1,n); if(abs(x)>abs(y))ckadd(ans,GetST(GetCell(y+1,0),GetCell(y+2,0),n+1,abs(x)-abs(y))); if(abs(x)<abs(y))ckadd(ans,GetST(GetCell(x,x+1),GetCell(x,x+2),n+1,abs(y)-abs(x))); }else if(x>=0&&y<0){ ans=add((n>0?GetSQ(2,7,n-1):0),Ari(1,7,n)); ckadd(ans,add(mul(n,GetCell(0,-n)),sum1(n))); if(abs(x)>abs(y))ckadd(ans,GetST(GetCell(-y+1,y),GetCell(-y+2,y),n+1,abs(x)-abs(y))); if(abs(x)<abs(y))ckadd(ans,GetST(GetCell(0,-x-1),GetCell(0,-x-2),n+1,abs(y)-abs(x))); }else if(x<0&&y>=0){ ans=GetSQ(1,3,n); if(abs(x)>abs(y))ckadd(ans,GetST(GetCell(-y-1,y),GetCell(-y-2,y),n+1,abs(x)-abs(y))); if(abs(x)<abs(y))ckadd(ans,GetST(GetCell(0,-x+1),GetCell(0,-x+2),n+1,abs(y)-abs(x))); }else if(x<0&&y<0){ ans=GetSQ(1,5,n); if(abs(x)>abs(y))ckadd(ans,GetST(GetCell(y-1,0),GetCell(y-2,0),n+1,abs(x)-abs(y))); if(abs(x)<abs(y))ckadd(ans,GetST(GetCell(x,x-1),GetCell(x,x-2),n+1,abs(y)-abs(x))); } return ans; } int Get(int x1,int y1,int x2,int y2){ if(x1>x2||y1>y2)return 0; if(x1>=0&&y1>=0)return sub(add(Get(x2,y2),x1!=0&&y1!=0?Get(x1-1,y1-1):0),add(x1!=0?Get(x1-1,y2):0,y1!=0?Get(x2,y1-1):0)); if(x1<0&&y1>=0)return sub(add(Get(x1,y2),x2!=0&&y1!=0?Get(x2+1,y1-1):0),add(x2!=0?Get(x2+1,y2):0,y1!=0?Get(x1,y1-1):0)); if(x1>=0&&y1<0)return sub(add(Get(x2,y1),x1!=0&&y2!=0?Get(x1-1,y2+1):0),add(x1!=0?Get(x1-1,y1):0,y2!=0?Get(x2,y2+1):0)); if(x1<0&&y1<0)return sub(add(Get(x1,y1),x2!=0&&y2!=0?Get(x2+1,y2+1):0),add(x2!=0?Get(x2+1,y1):0,y2!=0?Get(x1,y2+1):0)); } int main(){ int n,q; scanf("%i %i",&n,&q); while(q--){ int x1,y1,x2,y2; scanf("%i %i %i %i",&x1,&y1,&x2,&y2); int ans=add(add(Get(max(0,x1),max(0,y1),x2,y2),Get(x1,max(0,y1),min(-1,x2),y2)),add(Get(max(0,x1),y1,x2,min(-1,y2)),Get(x1,y1,min(-1,x2),min(-1,y2)))); printf("%i\n",ans); } return 0; }

컴파일 시 표준 에러 (stderr) 메시지

spiral.cpp: In function 'int Get(int, int, int, int)':
spiral.cpp:69:1: warning: control reaches end of non-void function [-Wreturn-type]
   69 | }
      | ^
spiral.cpp: In function 'int main()':
spiral.cpp:72:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   72 |  scanf("%i %i",&n,&q);
      |  ~~~~~^~~~~~~~~~~~~~~
spiral.cpp:75:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   75 |   scanf("%i %i %i %i",&x1,&y1,&x2,&y2);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
spiral.cpp: In function 'int Get(int, int)':
spiral.cpp:61:9: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   61 |  return ans;
      |         ^~~
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