【洛谷P1039】侦探推理

侦探推理

题目链接

这是一道恶心至极的模拟题

我们可以枚举罪犯是谁，今天是星期几，从而判断每个人说的话是真是假

若每个人说的话的真假一致，且说谎话的人数<=k且说真话的人数<=m-k，就是一个符合的方案

而此题的精髓在于字符串的处理！

要知道每句话的末尾会有一个空格（为此爆到30分）

以及以下坑点：https://www.luogu.org/discuss/show/27320

CENGJINGYOUYIDUANZHENZHIDEGANQINGFANGZAIWOMIANQIANWOMEIYOUZHENXIDENGDAOSHIQULEYIHOUCAIZHUIHUIMOJIRENSHIJIANZUITONGKUDESHIMOGUOYUCIRUGUOSHANGTIANNENGGEIWOYIGEZAILAIYICIDEJIHUIWOHUIDUINAGENVHAIZISHUOSANGEZI：NIMABI ！！！

具体看代码吧

#include<iostream>
#include<cstring>
#include<cstdio>
#include<map>
using namespace std;
#define N 25
int n,m,p,cnt,ans;
map<string,int> M;
struct ZC{
    int pos,type,to;
    //type 0:罪犯 1:不是罪犯 2:to是罪犯 3:to不是罪犯 4:today是to
} a[N];
string s[N],s1,s2,s3,s4,d1,d2,d3,d4,d5,d6,d7;
int h[N];
int main()
{
    s1=" I am guilty.";
    s2=" I am not guilty.";
    s3=" is guilty.";
    s4=" is not guilty.";
    d1=" Today is Monday.";
    d2=" Today is Tuesday.";
    d3=" Today is Wednesday.";
    d4=" Today is Thursday.";
    d5=" Today is Friday.";
    d5=" Today is Saturday.";
    d7=" Today is Sunday.";
    string x;
    scanf("%d%d%d",&m,&n,&p);
    getline(cin,x);
    for(int i=1;i<=m;i++){
        cin>>s[i];
        M[s[i]]=i;
    }
    while(p--){
        cin>>x;
        x.erase(x.end()-1);
        if(!M[x]){
            getline(cin,x);
            continue;
        }
        a[++cnt].pos=M[x];
        getline(cin,x);
        int it=x.find('.',0);
        x.erase(it+1,x.length()-1);
        if(x==s1) a[cnt].type=0;
        else if(x==s2){ a[cnt].type=1; }
        else if(x==d1){ a[cnt].type=4; a[cnt].to=1; }
        else if(x==d2){ a[cnt].type=4; a[cnt].to=2; }
        else if(x==d3){ a[cnt].type=4; a[cnt].to=3; }
        else if(x==d4){ a[cnt].type=4; a[cnt].to=4; }
        else if(x==d5){ a[cnt].type=4; a[cnt].to=5; }
        else if(x==d6){ a[cnt].type=4; a[cnt].to=6; }
        else if(x==d7){ a[cnt].type=4; a[cnt].to=7; }
         else{
             x.erase(0,1);
             int it=x.find(' ',0);
             string y=x.substr(0,it);
             x.erase(0,it);
            if(!M[y]){
                cnt--;
                continue;
            }
            a[cnt].to=M[y];
            if(x==s3) a[cnt].type=2;
            else if(x==s4) a[cnt].type=3;
            else cnt--;
        }
    }
    for(int gu=1;gu<=m;gu++){
        bool Flag=0;
         for(int day=1;day<=7;day++){
             memset(h,0,sizeof(h));
            bool flag=1; int tot1=0,tot2=0;
             for(int i=1;i<=cnt;i++){
                 int k;
                 switch(a[i].type){
                     case 0:{
                         if(a[i].pos==gu) k=1;
                         else k=2;
                        break;
                    }
                    case 1:{
                        if(a[i].pos!=gu) k=1;
                        else k=2;
                        break;
                    }
                    case 2:{
                        if(a[i].to==gu) k=1;
                        else k=2;
                        break;
                    }
                    case 3:{
                        if(a[i].to!=gu) k=1;
                        else k=2;
                        break;
                    }
                    case 4:{
                        if(a[i].to==day) k=1;
                        else k=2;
                        break;
                    }
                 }
                if(!h[a[i].pos])
                    h[a[i].pos]=k;
                else if(h[a[i].pos]!=k) flag=0;
                if(!flag) break;
            }
            if(!flag) continue;
            for(int i=1;i<=m;i++)
             if(h[i]==1) tot1++;
             else if(h[i]==2) tot2++;
            if(tot2<=n&&n<=m-tot1){
                Flag=1; break;
            }
        }
        if(Flag){
            if(ans){
                puts("Cannot Determine");
                return 0;
            }
            else ans=gu;
        }
    }
    if(ans) cout<<s[ans]<<endl;
    else puts("Impossible");
    return 0;
}
/*
附几个样例

3 1 5
MIKE
CHARLES
KATE
MIKE: I am guilty.
MIKE: Today is Sunday.
CHARLES: MIKE is guilty.
KATE: I am guilty.
KATE: How are you??


2 2 4
HELLO
GUILTY
HELLO: What is your name?
GUILTY: I am GUILTY.
GUILTY: Are you guilty?   
HELLO: I am not guilty.   

5 1 5
A
B
C
D
E
A: Today is Monday.
B: Today is Thursday.
C: Today is Monday.
B: D is not guilty.
E: I am not guilty.

*/