Compilare: main.cpp: In function 'std::vector<int> BigMulty(const std::vector<int>&, const std::vector<int>&)': main.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < B.size(); ++i ) ~~^~~~~~~~~~ main.cpp:18:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < A.size(); ++j ) ~~^~~~~~~~~~ main.cpp:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < ans.size(); ++i ) ~~^~~~~~~~~~~~ main.cpp:15:9: warning: unused variable 't' [-Wunused-variable] int t = 0; ^ main.cpp: In function 'std::vector<int> BigAdd(const std::vector<int>&, const std::vector<int>&)': main.cpp:57:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i < A.size() ) ans[i] += A[i]; ~~^~~~~~~~~~ main.cpp:58:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i < B.size() ) ans[i] += B[i]; ~~^~~~~~~~~~