Compilare: main.cpp: In function 'void DFS(int)': main.cpp:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<M[node].size(); i++){ ~^~~~~~~~~~~~~~~ main.cpp: In function 'void solve(int)': main.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<M[node].size(); i++){ ~^~~~~~~~~~~~~~~ main.cpp:31:9: warning: unused variable 'ans' [-Wunused-variable] int ans = 0, i, next; ^~~ main.cpp: In function 'int main()': main.cpp:81:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<rasp.size(); i++) ~^~~~~~~~~~~~ main.cpp:52:21: warning: unused variable 'pr' [-Wunused-variable] long long n, m, pr, cost, i, j, nr=0, cump=0, node, a, b; ^~ main.cpp:52:25: warning: unused variable 'cost' [-Wunused-variable] long long n, m, pr, cost, i, j, nr=0, cump=0, node, a, b; ^~~~ main.cpp:52:34: warning: unused variable 'j' [-Wunused-variable] long long n, m, pr, cost, i, j, nr=0, cump=0, node, a, b; ^ main.cpp:52:37: warning: unused variable 'nr' [-Wunused-variable] long long n, m, pr, cost, i, j, nr=0, cump=0, node, a, b; ^~ main.cpp:52:43: warning: unused variable 'cump' [-Wunused-variable] long long n, m, pr, cost, i, j, nr=0, cump=0, node, a, b; ^~~~