Submission #13743

#TimeUsernameProblemLanguageResultExecution timeMemory
13743gs13068역사적 조사 (JOI14_historical)C++98
100 / 100
1066 ms245676 KiB
#include<cstdio> #include<algorithm> int a[111111]; int t[111111],tn; int c[111111][555]; long long d[555][555]; int p[111111]; int main() { long long res; int i,j,k,s,e,n,m,l,r; scanf("%d%d",&n,&m); for(i=0;i<n;i++) { scanf("%d",&a[i]); t[i]=a[i]; } std::sort(t,t+n); tn=std::unique(t,t+n)-t; for(i=0;i<n;i++)a[i]=std::lower_bound(t,t+tn,a[i])-t; for(i=0;i<n;i++) { if(!(i&255))for(j=0;j<tn;j++)c[j][(i>>8)+1]=c[j][i>>8]; c[a[i]][(i>>8)+1]++; } for(i=0;i<(n>>8);i++) { for(j=i+1;j<=(n>>8);j++) { d[i][j]=d[i][j-1]; for(k=(j-1)<<8;k<(j<<8);k++)if(1LL*t[a[k]]*(c[a[k]][j]-c[a[k]][i])>d[i][j])d[i][j]=1LL*t[a[k]]*(c[a[k]][j]-c[a[k]][i]); } } while(m--) { scanf("%d%d",&s,&e); s--; l=(s+255)>>8; r=e>>8; if(l<r) { res=d[l][r]; for(i=s;i<(l<<8);i++)p[a[i]]++; for(i=r<<8;i<e;i++)p[a[i]]++; for(i=s;i<(l<<8);i++)if(1LL*t[a[i]]*(p[a[i]]+c[a[i]][r]-c[a[i]][l])>res)res=1LL*t[a[i]]*(p[a[i]]+c[a[i]][r]-c[a[i]][l]); for(i=r<<8;i<e;i++)if(1LL*t[a[i]]*(p[a[i]]+c[a[i]][r]-c[a[i]][l])>res)res=1LL*t[a[i]]*(p[a[i]]+c[a[i]][r]-c[a[i]][l]); for(i=s;i<(l<<8);i++)p[a[i]]--; for(i=r<<8;i<e;i++)p[a[i]]--; } else { res=0; for(i=s;i<e;i++)p[a[i]]++; for(i=s;i<e;i++)if(1LL*t[a[i]]*p[a[i]]>res)res=1LL*t[a[i]]*p[a[i]]; for(i=s;i<e;i++)p[a[i]]--; } printf("%lld\n",res); } }
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