Point

#include <stdio.h>

int one, two, three, four;

int max(int a, int b){
    return a>=b?a:b;
}

void checkQuadrant(int x, int y){
    if(x>0 && y>0){
        one++;
    }else if(x<0 && y>0){
        two++;
    }else if(x<0 && y<0){
        three++;
    }else if(x>0 && y<0){
        four++;
    }
}

int main(){
    int tc, x, y, n;
    scanf("%d", &tc);
    for(int i=1;i<=tc;i++){
        one=two=three=four=0;
        scanf("%d", &n);
        for(int j=0;j<n;j++){
            scanf("%d %d", &x, &y);
            checkQuadrant(x, y);
        }
        printf("Case #%d: %s\n", i, n-max(one,max(two,max(three,four)))>1?"NO":"YES");
    }
    return 0;
}