Compilare: user.cpp: In function ‘int main()’: user.cpp:29:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^ user.cpp:33:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&v[i].l,&v[i].r); ^ user.cpp:40:27: warning: iteration 201u invokes undefined behavior [-Waggressive-loop-optimizations] fr1[i] = fr1[i - 1] + (fr1[i] > 0); ^ user.cpp:39:5: note: containing loop for(i = 1; i <= MAXVAL; i++) { ^