Compilare: main.cpp: In function 'int main()': main.cpp:62:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < lvl[i-1].size() ; j++){ ~~^~~~~~~~~~~~~~~~~ main.cpp:68:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < v[road[i]].size() ; j++){ ~~^~~~~~~~~~~~~~~~~~~ main.cpp:34:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&x); ^ main.cpp:36:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&a,&b); ^ main.cpp:41:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&val[i]); ^