poj 1029（模拟）

#include<iostream>
#include<cstring>
using namespace std;
int f[1005],l[105][505],r[105][505];
char c[105];
int main(){
    int n,k,i,j,w[505],t,ans,ansi,tmp[1005];
    cin>>n>>k;
    for(i=1;i<=k;i++){
        cin>>w[i];
        for(j=1;j<=w[i];j++){
            cin>>l[i][j];
        }
        for(j=1;j<=w[i];j++){
            cin>>r[i][j];
        }
        cin>>c[i];
    }
    for(i=1;i<=n;i++){
        f[i] = -2;
    }
    for(i=1;i<=k;i++){
        memset(tmp,0,sizeof(tmp));
        if(c[i]=='='){
            for(j=1;j<=w[i];j++){
                f[l[i][j]] = 0;
                f[r[i][j]] = 0;
            }
        }
        else if(c[i]=='<'){
            for(j=1;j<=w[i];j++){
                tmp[l[i][j]] = 1;
                tmp[r[i][j]] = 1;
                if(f[l[i][j]]==-2){
                    f[l[i][j]] = -1;
                }
                else if(f[l[i][j]]==1){
                    f[l[i][j]] = 0;
                }
                if(f[r[i][j]]==-2){
                    f[r[i][j]] = 1;
                }
                else if(f[r[i][j]]==-1){
                    f[r[i][j]] = 0;
                }
            }
            for(j=1;j<=n;j++){
                if(tmp[j]==0){
                    f[j] = 0;
                }
            }
        }
        else if(c[i]=='>'){
            for(j=1;j<=w[i];j++){
                tmp[l[i][j]] = 1;
                tmp[r[i][j]] = 1;
                if(f[l[i][j]]==-2){
                    f[l[i][j]] = 1;
                }
                else if(f[l[i][j]]==-1){
                    f[l[i][j]] = 0;
                }
                if(f[r[i][j]]==-2){
                    f[r[i][j]] = -1;
                }
                else if(f[r[i][j]]==1){
                    f[r[i][j]] = 0;
                }
            }
            for(j=1;j<=n;j++){
                if(tmp[j]==0){
                    f[j] = 0;
                }
            }
        }
    }
    ans = n;
    ansi = 0;
    for(i=1;i<=n;i++){
        if(f[i]!=0){
            ans--;
            ansi = i;
        }
    }
    if(ans==n-1){
        cout<<ansi<<endl;
    }
    else{
        cout<<"0"<<endl;
    }
    return 0;
}