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#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; }
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