Compilare: main.cpp: In function 'int main()': main.cpp:31:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<graph[x].size();i++){ ~^~~~~~~~~~~~~~~~ main.cpp:11:30: warning: variable 'dx' set but not used [-Wunused-but-set-variable] int n, m, i, c, a, b, x, dx, y, dxy; ^~ main.cpp:14:32: 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:16:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &a, &b, &c); ^