Compilare: main.cpp: In function 'void inreg(int, int)': main.cpp:36:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < con.size(); i++) ~~^~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int, int)': main.cpp:45:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < a[x].size(); i++) { ~~^~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:60:9: warning: unused variable 'i' [-Wunused-variable] int i; ^ main.cpp: In function 'void output()': main.cpp:70:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < C[i].size(); j++) ~~^~~~~~~~~~~~~