i was not able to initially figure out the method on this problem,But then i was able to understand that,only the correct n solution should have the minimum time limit,but if any wrong m solution has a time limit which is lesser than the highest time limit of the correct n solution,a TL cannot be set for that problem,For which "-1" has to be printed,but when i look at the code why should max(2*v,p)<s is taken?Where v is the min of a[i] and p is the max of a[i] and s is the min of b[i],instead of which p<s can be directly taken ?Is it wrong to just consider p<s ? For this problem