Compilare: user.cpp: In member function ‘long long int Graph::Kruskal()’: user.cpp:64:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < this->nodes.size(); i++) { ^ user.cpp:67:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < edges.size(); i++) { ^ user.cpp:79:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < result.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:122:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < coordinates.size(); ++j) { ^ user.cpp:123:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < coordinates.size(); ++k) { ^ user.cpp:107:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.cpp:111:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:118:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &x, &y); ^