Compilare: main.cpp: In function 'void biconnected_components(int)': main.cpp:53:15: 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:154:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < sol.size(); i++) { ~~^~~~~~~~~~~~ main.cpp:114:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^ main.cpp:116:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &x, &y); ^