Compilare: user.cpp: In function ‘int main()’: user.cpp:100:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &n, &q); ^ user.cpp:101:98: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i = 2; i <= n; i++) fscanf(fi,"%d%d", &father[i], &len[i]), G[father[i]].push_back(i); ^ user.cpp:105:93: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i = 1; i <= q; i++) fscanf(fi,"%d%d%d", &Q[i].x, &Q[i].y, &Q[i].c), Q[i].ind = i; ^