Compilare: main.cpp:5:0: warning: ignoring #pragma optimize [-Wunknown-pragmas] #pragma optimize ("O3") main.cpp: In function 'int main()': main.cpp:26:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n) ; ^ main.cpp:28:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", v + i) ; ^