Sorting array of pairs or vector of pair in cpp

#1

Please explain how can we sort array of pairs or vector of pairs in c++ based second element of the pair.What should we pass in sort() and compare()

#2

Refer this

#3

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#4

Link:https://ide.codingblocks.com/s/333872.Please correct this code.I made the ame code using top down approach,its printing some garbage value,lease correct it ans tell me my error