Compilare: user.cpp: In function ‘int main()’: user.cpp:78:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size(); ++i) { ^ user.cpp:70:6: warning: unused variable ‘a’ [-Wunused-variable] int a, b; ^ user.cpp:70:9: warning: unused variable ‘b’ [-Wunused-variable] int a, b; ^ user.cpp:71:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.cpp:73:67: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &edges[i].x, &edges[i].y, &edges[i].weight); ^