Compilare: main.cpp: In function 'int main()': main.cpp:33:45: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d %d", &n, &m, &s, &F); ^ main.cpp:35:51: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for (int i=1;i<=m;i++) fscanf(f, "%d", &lg[i]); ^ main.cpp:36:77: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for (int i=1;i<=n;i++) fscanf(f, "%d %d", &seg[i].first, &seg[i].second); ^