/in/ex1_1.cpp: In function 'int isSort(std::vector<int>)':
/in/ex1_1.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i<arr.size(); i++){
                     ~^~~~~~~~~~~
/in/ex1_1.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < arr.size(); i++){
                     ~~^~~~~~~~~~~~
/in/ex1_1.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < arr.size(); i++){
                     ~~^~~~~~~~~~~~