How I can start learning algorithms for ICPC to solve problems on codeforces?

Question

I am good in c++ but some problems in codeforces I can't solved it -_-

Answer 1

there are lot many platforms out there, first thing stick to one and practice a lot n lot

hackerearth is having great tutorial series under 'code monk'.
hackerrank is good for beginners it has good classification of different problem categories.
topcoder n codeforces have some of the world's best competitive coders refer there blogs and codes.
there are lot many others like spoj, uva, codechef etc but for starting up I would recommend hackerrank.

in terms of books 'introduction to algorithm' is highly recommended among others.

for video tutorials u can use MITs open course of introduction to algorithm, from YouTube or MIT official site.