Compilare: main.cpp: In function 'int main()': main.cpp:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<=graf[i].size()-1; ++k) ~^~~~~~~~~~~~~~~~~~ main.cpp:48:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<=graf[0].size()-1; ++i) ~^~~~~~~~~~~~~~~~~~ main.cpp:21:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n,&m); ^ main.cpp:24:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &x,&y,&c); ^