liste.cpp: In function 'bool intersect(std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)': liste.cpp:12: warning: comparison between signed and unsigned integer expressions liste.cpp:15: warning: comparison between signed and unsigned integer expressions liste.cpp:21: warning: comparison between signed and unsigned integer expressions liste.cpp: In function 'std::vector<int, std::allocator<int> > merge(std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)': liste.cpp:28: warning: comparison between signed and unsigned integer expressions liste.cpp:34: warning: comparison between signed and unsigned integer expressions liste.cpp:40: warning: comparison between signed and unsigned integer expressions