Compilare: main.cpp: In function 'int main()': main.cpp:68:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod][0].size();i++){ ~^~~~~~~~~~~~~~~~~ main.cpp:43:15: warning: unused variable 'j' [-Wunused-variable] int n,m,i,j,a,b,c,nod,val,nod2,val2; ^ main.cpp: In function 'int cit()': main.cpp:20:33: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(BUFF,1,LEN,fi); ^ main.cpp:27:33: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(BUFF,1,LEN,fi); ^ main.cpp: In function 'int main()': main.cpp:47:25: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(BUFF,1,LEN,fi); ^