Compilare: user.cpp: In function ‘int main()’: user.cpp:33:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<lin[i].size();j++){ ^ user.cpp:25:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d%d%d%d", &n, &m, &q, &t); ^ user.cpp:27:57: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d%d%d%d%d", &x1, &y1, &x2, &y2, &c); ^