Compilare: main.cpp: In function 'int main()': main.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l=0;l<per[j].size();l++){ ~^~~~~~~~~~~~~~ main.cpp:43:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(l==per[j].size()){ ~^~~~~~~~~~~~~~~ main.cpp:16:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&n,&k,&MOD); ^ main.cpp:21:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x,&y); ^