salesman.cpp: In function 'int main()':
salesman.cpp:8:1041: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
int n,u,d,s,uptree[2*MAXN],downtree[2*MAXN];int query(int *arr,int l,int r){ int ans=-INF; for(l+=MAXN,r+=MAXN;l<=r;l>>=1,r>>=1) { if(l&1) ans=max(ans,arr[l++]); if(~r&1) ans=max(ans,arr[r--]); } return ans;}void update(int *arr,int x,int v){ x+=MAXN; arr[x]=max(arr[x],v); for(;x>1;x>>=1) arr[x>>1]=max(arr[x],arr[x^1]);}void updatep(int x,int v){ update(uptree,x,v-u*x); update(downtree,x,v+d*x);}int realquery(int a){ return max(query(downtree,0,a)-d*a,query(uptree,a,MAXN-1)+u*a);}void markt(vpi &market){ if(market.size()==0) return; sort(market.begin(),market.end()); vector<int> U,D; int sz=market.size(); for(int i=0;i<sz;i++) { int temp=realquery(market[i].first); U.push_back(temp),D.push_back(temp); } for(int i=0;i<sz;i++) { if(i!=0) D[i]=max(D[i],D[i-1]-d*(market[i].first-market[i-1].first)); D[i]+=market[i].second; } for(int i=sz-1;i>=0;i--) { if(i!=sz-1) U[i]=max(U[i],U[i+1]-u*(market[i+1].first-market[i].first)); U[i]+=market[i].second; } for(int i=0;i<sz;i++) updatep(market[i].first,max(U[i],D[i]));}int main(){ scanf("%d %d %d %d",&n,&u,&d,&s); for(int i=0,x,y,z;i<n;i++) { scanf("%d %d %d",&x,&y,&z); mark[x].push_back(make_pair(y,z)); } memset(uptree,0xc0,sizeof(uptree)); memset(downtree,0xc0,sizeof(downtree)); updatep(s,0); for(int i=1;i<=500001;i++) markt(mark[i]); return !printf("%d",realquery(s));}
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
salesman.cpp:8:1104: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
int n,u,d,s,uptree[2*MAXN],downtree[2*MAXN];int query(int *arr,int l,int r){ int ans=-INF; for(l+=MAXN,r+=MAXN;l<=r;l>>=1,r>>=1) { if(l&1) ans=max(ans,arr[l++]); if(~r&1) ans=max(ans,arr[r--]); } return ans;}void update(int *arr,int x,int v){ x+=MAXN; arr[x]=max(arr[x],v); for(;x>1;x>>=1) arr[x>>1]=max(arr[x],arr[x^1]);}void updatep(int x,int v){ update(uptree,x,v-u*x); update(downtree,x,v+d*x);}int realquery(int a){ return max(query(downtree,0,a)-d*a,query(uptree,a,MAXN-1)+u*a);}void markt(vpi &market){ if(market.size()==0) return; sort(market.begin(),market.end()); vector<int> U,D; int sz=market.size(); for(int i=0;i<sz;i++) { int temp=realquery(market[i].first); U.push_back(temp),D.push_back(temp); } for(int i=0;i<sz;i++) { if(i!=0) D[i]=max(D[i],D[i-1]-d*(market[i].first-market[i-1].first)); D[i]+=market[i].second; } for(int i=sz-1;i>=0;i--) { if(i!=sz-1) U[i]=max(U[i],U[i+1]-u*(market[i+1].first-market[i].first)); U[i]+=market[i].second; } for(int i=0;i<sz;i++) updatep(market[i].first,max(U[i],D[i]));}int main(){ scanf("%d %d %d %d",&n,&u,&d,&s); for(int i=0,x,y,z;i<n;i++) { scanf("%d %d %d",&x,&y,&z); mark[x].push_back(make_pair(y,z)); } memset(uptree,0xc0,sizeof(uptree)); memset(downtree,0xc0,sizeof(downtree)); updatep(s,0); for(int i=1;i<=500001;i++) markt(mark[i]); return !printf("%d",realquery(s));}
~~~~~^~~~~~~~~~~~~~~~~~~~~