Compilare: user.cpp: In function ‘void pre()’: user.cpp:53:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ind[v[i].s][j]<sali[j].size() && v[ sali[j][ ind[v[i].s][j] ] ].y + A[j] + B[v[i].s] <= v[i].x) ^ user.cpp: In function ‘int main()’: user.cpp:102:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:105:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&A[i]); ^ user.cpp:107:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&B[i]); ^ user.cpp:111:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&v[i].s,&v[i].x,&v[i].y); ^