Compilare: main.cpp: In function 'int main()': main.cpp:38:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rangemode.in","r",stdin); ^ main.cpp:39:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rangemode.out","w",stdout); ^ main.cpp:40:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&q); ^ main.cpp:43:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ main.cpp:49:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ main.cpp:59:14: warning: iteration 100005 invokes undefined behavior [-Waggressive-loop-optimizations] fv[j]=0; ~~~~~^~ main.cpp:58:21: note: within this loop for(int j=0; j<=NMAX; j++) ^