Compilare: main.cpp: In function 'void Solve()': main.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<Prices[i].size();++j) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void Read()': main.cpp:16:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&N,&M,&Q); ^ main.cpp:19:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&X,&Y,&P); ^ main.cpp: In function 'void Solve()': main.cpp:31:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&Node,&Cost); ^