Compilare: main.cpp: In function 'bool PairUp(int)': main.cpp:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graf[k].size(); i++) { ~~^~~~~~~~~~~~~~~~ main.cpp:32:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graf[k].size(); i++) { ~~^~~~~~~~~~~~~~~~ main.cpp:23:12: warning: unused variable 'j' [-Wunused-variable] int i, j, newV; ^ main.cpp: In function 'int main()': main.cpp:45:12: warning: unused variable 'j' [-Wunused-variable] int i, j; ^