Compilare: main.cpp: In function 'int main()': main.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < ordered_sol.size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:48:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < sol[ordered_sol[i]].size(); j++) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:21:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ main.cpp:29:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^