Compilare: main.cpp: In function 'int main()': main.cpp:12:49: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d%d", &n, &l, &u, &v[1] ); ^ main.cpp:15:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &v[i] ); ^ main.cpp:22:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &v[i] ); ^ main.cpp:24:16: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized] if(dq[s]==i-u-1) ~~~~^