Compilare: main.cpp: In function 'void dfs_minim(int)': main.cpp:31:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < graph[x].size() ; ++ i) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:39:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n) ; ^ main.cpp:41:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &x) ; ^ main.cpp:45:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", a + i) ; ^