Compilare: main.cpp: In function 'bool PairUp(int)': main.cpp:22:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graf[k].size(); i++) { ~~^~~~~~~~~~~~~~~~ main.cpp:30:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graf[k].size(); i++) { ~~^~~~~~~~~~~~~~~~ main.cpp:21:12: warning: unused variable 'j' [-Wunused-variable] int i, j, newV; ^ main.cpp: In function 'void Match()': main.cpp:42:12: warning: unused variable 'j' [-Wunused-variable] int i, j, cuplaj = 0; ^ main.cpp: In function 'int main()': main.cpp:71:12: warning: unused variable 'j' [-Wunused-variable] int i, j; ^