제출 #291194

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
291194	2020-09-04 21:04:10	TadijaSebez	Star Trek (CEOI20_startrek)	C++11	100 / 100	285 ms	54368 KiB

startrek

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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
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);}
void cksub(int&x,int y){x=sub(x,y);}
void ckmul(int&x,int y){x=mul(x,y);}
int powmod(int x,ll k){
  int ans=1;
  for(;k;k>>=1,ckmul(x,x))if(k&1)ckmul(ans,x);
  return ans;
}
const int N=100050;
int n;
ll d;
vector<int> E[N];
struct info{
  int x,y,z;
  info(int a=0,int b=0,int c=0):x(a),y(b),z(c){}
  info operator + (info b){return info(add(x,b.x),add(y,b.y),add(z,b.z));}
  info operator * (info b){return info(mul(x,b.x),add(mul(x,b.y),mul(b.x,y)),add(mul(x,b.z),mul(b.x,z)));}
  int get(int w,int l){return add(x,add(mul(w,y),mul(l,z)));}
  void p(){printf("%i %i %i\n",x,y,z);}
};
info operator += (info&a,info b){return a=a+b;}
info operator *= (info&a,info b){return a=a*b;}
 
 
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컴파일 시 표준 에러 (stderr) 메시지

startrek.cpp: In function 'int main()':
startrek.cpp:106:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  106 |  scanf("%i %lld",&n,&d);
      |  ~~~~~^~~~~~~~~~~~~~~~~
startrek.cpp:107:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  107 |  for(int i=1,u,v;i<n;i++)scanf("%i %i",&u,&v),E[u].pb(v),E[v].pb(u);
      |                          ~~~~~^~~~~~~~~~~~~~~

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