Compilare: main.cpp: In function 'void dfs(int)': main.cpp:44:16: 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:58:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < conex[i].size(); j++) ~~^~~~~~~~~~~~~~~~~ main.cpp:82:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (cost[i] == Min && a[i].size() > max_lenght) { ~~~~~~~~~~~~^~~~~~~~~~~~ main.cpp:76:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if (r1 != r2) ^ main.cpp:50:12: warning: unused variable 'cnt' [-Wunused-variable] int i, j, cnt = 0; ^~~ main.cpp: In function 'void output()': main.cpp:105:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < muchii.size(); i++) ~~^~~~~~~~~~~~~~~