Compilare: main.cpp: In function 'int main()': main.cpp:51:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[nod.second].size();i++){ ~^~~~~~~~~~~~~~~~~~~~~ main.cpp:12:21: warning: unused variable 'j' [-Wunused-variable] int n, m, k, i, j, f, x, y, dist; ^ main.cpp:21:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d", &n, &m, &k); ^ main.cpp:23:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &fort[i]); ^ main.cpp:40:40: 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, &dist); ^