标签:ext -- algorithm ane title panel show images editor
用两个栈模拟:
8 I 2 I -1 I 1 Q 3 L D R Q 2
2 3HintThe following diagram shows the status of sequence after each instruction:
#include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <stack> #include <vector> using namespace std; const int INF=0x3f3f3f3f; const int maxn=1001000; int Left[maxn],Right[maxn]; int sum[maxn],maxsum[maxn]; int nl,nr; char op[10]; int x,T_T,sz; void init() { nl=0; nr=0; maxsum[0]=-INF; sum[0]=0; sz=1; } int nextInt() { bool ok=false; int ret=0; char ch; int xi=0; while(ch=getchar()) { if(ch==‘-‘||(ch>=‘0‘&&ch<=‘9‘)) { ok=true; if(ch==‘-‘) xi=1; else ret=ret*10+ch-‘0‘; } else if(ok==true) break; } if(xi) ret*=-1; return ret; } char nextChar() { char ch=0; while(ch=getchar()) { if(ch==‘D‘||ch==‘R‘||ch==‘L‘||ch==‘Q‘||ch==‘I‘) { return ch; } } } int main() { while(scanf("%d",&T_T)!=EOF) { init(); while(T_T--) { op[0]=nextChar(); if(op[0]==‘I‘) { x=nextInt(); Left[nl++]=x; sum[sz]=sum[sz-1]+x; maxsum[sz]=max(maxsum[sz-1],sum[sz]); sz++; } else if(op[0]==‘D‘) { if(nl==0) continue; nl--; sz--; } else if(op[0]==‘L‘) { if(nl==0) continue; int t=Left[nl-1]; nl--; Right[nr++]=t; sz--; } else if(op[0]==‘R‘) { if(nr==0) continue; int t=Right[nr-1]; nr--; Left[nl++]=t; sum[sz]=sum[sz-1]+t; maxsum[sz]=max(maxsum[sz-1],sum[sz]); sz++; } else if(op[0]==‘Q‘) { int x; x=nextInt(); printf("%d\n",maxsum[x]); } } } return 0; }
标签:ext -- algorithm ane title panel show images editor
原文地址:http://www.cnblogs.com/mthoutai/p/6741792.html