Compilare: user.cpp: In function ‘void pre()’: user.cpp:56:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ind[v[i].s][j]<sali[j].size() && ui v[ sali[j][ ind[v[i].s][j] ] ].y + ui A[j] + ui B[v[i].s] <= ui v[i].x) ^ user.cpp: In function ‘int main()’: user.cpp:125:26: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (Z,1,(1<<22),f); ^