CodeForces - 416A (判断大于小于等于 模拟题)
2016-05-24 10:16
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Guess a number!
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Description
A TV show called "Guess a number!" is gathering popularity. The whole Berland, the old and the young, are watching the show.
The rules are simple. The host thinks of an integer y and the participants guess it by asking questions to the host. There are four types of acceptable questions:
Is it true that y is strictly larger than number x?
Is it true that y is strictly smaller than number x?
Is it true that y is larger than or equal to number x?
Is it true that y is smaller than or equal to number x?
On each question the host answers truthfully, "yes" or "no".
Given the sequence of questions and answers, find any integer value of y that meets the criteria of all answers. If there isn't such value, print "Impossible".
Input
The first line of the input contains a single integer n (1 ≤ n ≤ 10000) — the number of questions (and answers). Next n lines each contain one question and one answer to it. The format of each line is like that: "sign x answer", where the sign is:
">" (for the first type queries),
"<" (for the second type queries),
">=" (for the third type queries),
"<=" (for the fourth type queries).
All values of x are integer and meet the inequation - 109 ≤ x ≤ 109. The answer is an English letter "Y" (for "yes") or "N" (for "no").
Consequtive elements in lines are separated by a single space.
Output
Print any of such integers y, that the answers to all the queries are correct. The printed number y must meet the inequation - 2·109 ≤ y ≤ 2·109. If there are many answers, print any of them. If such value doesn't exist, print word "Impossible" (without the quotes).
Sample Input
Input
Output
Input
Output
Source
Codeforces Round #241 (Div. 2)
Time Limit: 1000MS | Memory Limit: 262144KB | 64bit IO Format: %I64d & %I64u |
Description
A TV show called "Guess a number!" is gathering popularity. The whole Berland, the old and the young, are watching the show.
The rules are simple. The host thinks of an integer y and the participants guess it by asking questions to the host. There are four types of acceptable questions:
Is it true that y is strictly larger than number x?
Is it true that y is strictly smaller than number x?
Is it true that y is larger than or equal to number x?
Is it true that y is smaller than or equal to number x?
On each question the host answers truthfully, "yes" or "no".
Given the sequence of questions and answers, find any integer value of y that meets the criteria of all answers. If there isn't such value, print "Impossible".
Input
The first line of the input contains a single integer n (1 ≤ n ≤ 10000) — the number of questions (and answers). Next n lines each contain one question and one answer to it. The format of each line is like that: "sign x answer", where the sign is:
">" (for the first type queries),
"<" (for the second type queries),
">=" (for the third type queries),
"<=" (for the fourth type queries).
All values of x are integer and meet the inequation - 109 ≤ x ≤ 109. The answer is an English letter "Y" (for "yes") or "N" (for "no").
Consequtive elements in lines are separated by a single space.
Output
Print any of such integers y, that the answers to all the queries are correct. The printed number y must meet the inequation - 2·109 ≤ y ≤ 2·109. If there are many answers, print any of them. If such value doesn't exist, print word "Impossible" (without the quotes).
Sample Input
Input
4 >= 1 Y < 3 N <= -3 N > 55 N
Output
17
Input
2 > 100 Y < -100 Y
Output
Impossible
Source
Codeforces Round #241 (Div. 2)
#include <iostream> #include <stdio.h> #include <stdlib.h> #include<string.h> #include<algorithm> #include<math.h> using namespace std; int f[100005]; int main() { int n,min0=-1000001000,max0=1000010000; cin>>n; for(int i=0;i<n;i++) { char x[3],an;int num; cin>>x>>num>>an; if(an=='Y'&&x[0]=='>') { if(x[1]=='=') min0=max(min0,num); else min0=max(min0,num+1); } else if(an=='N'&&x[0]=='>') { if(x[1]=='=') max0=min(max0,num-1); else max0=min(max0,num); } else if(an=='Y'&&x[0]=='<') { if(x[1]=='=') max0=min(max0,num); else max0=min(max0,num-1); } else if(an=='N'&&x[0]=='<') { if(x[1]=='=') min0=max(min0,num+1); else min0=max(min0,num); } // cout<<max0<<' '<<min0<<endl; } if(max0>=min0) cout<<min0<<endl; else cout<<"Impossible"<<endl; return 0; }
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