Compilare: main.cpp: In function 'int main()': main.cpp:121:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (p=0;p<mch[j].size();p++){ ~^~~~~~~~~~~~~~ main.cpp:51:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&k); ^ main.cpp:49:27: warning: 'mid' may be used uninitialized in this function [-Wmaybe-uninitialized] int i,s,sol,len,st,dr,mid,p,vecin,j,newp; ^~~