Codeforces Round #444 (Div. 2) D. Ratings and Reality Shows 贪心

http://codeforces.com/problemset/problem/887/D

题意:有一个模特,她有一个初始rating值 s。她每天可能进行拍照或show中的一种活动。每拍一次照,rating增加 a, 每参加一次show,rating减少 b。她现在想参加一次脱口秀。参加完脱口秀后的 l 天内, 她拍一次照rating增加 c,每参加一次show rating减少 d。要求参加脱口秀之前以及脱口秀之后 l 天内,她的rating是非负的。给出一些天数(从 0 开始)和当天的活动,求她应该选择哪一天参加脱口秀。如果有多解,输出其中最小的那个。


按照题目的意思来说要找最小的,那么我从1-n开始连续l个,看是否造成rating一直为非负数,如果成立则找到答案。不成立则处理当前的i,然后更新rating继续找。


///                 .-~~~~~~~~~-._       _.-~~~~~~~~~-.
///             __.'              ~.   .~              `.__
///           .'//                  \./                  \\`.
///        .'//                     |                     \\`.
///       .'// .-~"""""""~~~~-._     |     _,-~~~~"""""""~-. \\`.
///     .'//.-"                 `-.  |  .-'                 "-.\\`.
///   .'//______.============-..   \ | /   ..-============.______\\`.
/// .'______________________________\|/______________________________`.
#pragma comment(linker, "/STACK:1024000000,1024000000")
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;

#define pi acos(-1)
#define s_1(x) scanf("%d",&x)
#define s_2(x,y) scanf("%d%d",&x,&y)
#define s_3(x,y,z) scanf("%d%d%d",&x,&y,&z)
#define s_4(x,y,z,X) scanf("%d%d%d%d",&x,&y,&z,&X)
#define S_1(x) scan_d(x)
#define S_2(x,y) scan_d(x),scan_d(y)
#define S_3(x,y,z) scan_d(x),scan_d(y),scan_d(z)
#define PI acos(-1)
#define endl '\n'
#define srand() srand(time(0));
#define me(x,y) memset(x,y,sizeof(x));
#define foreach(it,a) for(__typeof((a).begin()) it=(a).begin();it!=(a).end();it++)
#define close() ios::sync_with_stdio(0); cin.tie(0);
#define FOR(x,n,i) for(int i=x;i<=n;i++)
#define FOr(x,n,i) for(int i=x;i=x;i--)
#define fOr(n,x,i) for(int i=n;i>x;i--)
#define W while
#define sgn(x) ((x) < 0 ? -1 : (x) > 0)
#define bug printf("***********\n");
#define db double
#define ll long long
#define mp make_pair
#define pb push_back
typedef long long LL;
typedef pair  ii;
const int INF=0x3f3f3f3f;
const LL LINF=0x3f3f3f3f3f3f3f3fLL;
const int dx[]={-1,0,1,0,1,-1,-1,1};
const int dy[]={0,1,0,-1,-1,1,-1,1};
const int maxn=3e5+10;
const int maxx=1e6+10;
const double EPS=1e-8;
const double eps=1e-8;
const int mod=1e9+7;
templateinline T min(T a,T b,T c) { return min(min(a,b),c);}
templateinline T max(T a,T b,T c) { return max(max(a,b),c);}
templateinline T min(T a,T b,T c,T d) { return min(min(a,b),min(c,d));}
templateinline T max(T a,T b,T c,T d) { return max(max(a,b),max(c,d));}
template 
inline bool scan_d(T &ret){char c;int sgn;if (c = getchar(), c == EOF){return 0;}
while (c != '-' && (c < '0' || c > '9')){c = getchar();}sgn = (c == '-') ? -1 : 1;ret = (c == '-') ? 0 : (c - '0');
while (c = getchar(), c >= '0' && c <= '9'){ret = ret * 10 + (c - '0');}ret *= sgn;return 1;}

inline bool scan_lf(double &num){char in;double Dec=0.1;bool IsN=false,IsD=false;in=getchar();if(in==EOF) return false;
while(in!='-'&&in!='.'&&(in<'0'||in>'9'))in=getchar();if(in=='-'){IsN=true;num=0;}else if(in=='.'){IsD=true;num=0;}
else num=in-'0';if(!IsD){while(in=getchar(),in>='0'&&in<='9'){num*=10;num+=in-'0';}}
if(in!='.'){if(IsN) num=-num;return true;}else{while(in=getchar(),in>='0'&&in<='9'){num+=Dec*(in-'0');Dec*=0.1;}}
if(IsN) num=-num;return true;}

void Out(LL a){if(a < 0) { putchar('-'); a = -a; }if(a >= 10) Out(a / 10);putchar(a % 10 + '0');}
void print(LL a){ Out(a),puts("");}
//freopen( "in.txt" , "r" , stdin );
//freopen( "data.txt" , "w" , stdout );
//cerr << "run time is " << clock() << endl;

int n,a,b,c,d;
int s,l;
int t[maxn],q[maxn];
void solve()
{
	W(s_1(n)!=EOF)
	{
		s_4(a,b,c,d);
		s_2(s,l);
		t[0]=-1;
		FOR(1,n,i)
			s_2(t[i],q[i]);
		LL minc=LINF,rating=s,_=0;
		int now=1;
		FOR(1,n,i)
		{
			W(now<=n&&t[now]-t[i]=0)
			{
				print(t[i-1]+1);
				return ;
			}
			_-=(q[i]?c:-d);
			minc-=(q[i]?c:-d);
			rating+=(q[i]?a:-b);
			if(rating<0)
			{
				puts("-1");
				return ;
			}
		}
		print(t[n]+1);
	}
}
			
			
int main()
{
    //freopen( "1.txt" , "r" , stdin );
    //freopen( "data.txt" , "w" , stdout );
    int t=1;
    //init();
    //s_1(t);
    for(int cas=1;cas<=t;cas++)
    {
        //printf("Case #%d: ",cas);
        solve();
    }
}


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