Compilare: main.cpp: In function 'void DFS(int)': main.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:97:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; sol.size() < n - 1; i++) ~~~~~~~~~~~^~~~~~~ main.cpp:61:18: warning: unused variable 'a' [-Wunused-variable] int T, n, m, a, b, i, j, cate, s, cost, nre, coridel; ^ main.cpp:61:21: warning: unused variable 'b' [-Wunused-variable] int T, n, m, a, b, i, j, cate, s, cost, nre, coridel; ^ main.cpp:61:30: warning: unused variable 'cate' [-Wunused-variable] int T, n, m, a, b, i, j, cate, s, cost, nre, coridel; ^~~~ main.cpp:59:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ninjago.in", "r", stdin); ^ main.cpp:60:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ninjago.out", "w", stdout); ^ main.cpp:65:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &T, &n, &m); ^ main.cpp:68:47: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%s", &d[i].x, &d[i].y, str); ^