Compilare: main.cpp: In function 'int main()': main.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0; k<graph[j].size(); k++) ~^~~~~~~~~~~~~~~~ main.cpp:41:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0; k<graph[0].size(); k++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:14:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&n,&m); ^ main.cpp:23:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&x,&y); ^ main.cpp:25:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&cost[x][y]); ^