Compilare: user.cpp: In function ‘void Kruskal(int)’: user.cpp:30:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vect[start].size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~ user.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vect[n.dest].size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:79:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < result.size(); i++) { ~~^~~~~~~~~~~~~~~ user.cpp:83:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < result.size(); i++) { ~~^~~~~~~~~~~~~~~ user.cpp:54:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in", "r", stdin); ^ user.cpp:55:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out", "w", stdout); ^ user.cpp:58:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:66:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &length); ^