Compilare: user.cpp: In function ‘void bfs()’: user.cpp:39:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[u1].size(); i++){ ^ user.cpp: In function ‘bool dfs(int)’: user.cpp:53:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[u1].size(); i++){ ^ user.cpp: In function ‘void solve(int)’: user.cpp:95:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < g[is].size(); j++){ ^ user.cpp: In function ‘int main()’: user.cpp:114:16: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] in >> a[i] + 1; ^