Compilare: main.cpp: In function 'int main()': main.cpp:8:13: warning: unused variable 'i' [-Wunused-variable] int N,Q,i,x,y,aux; ^ main.cpp:6:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("qmatrix.in","r",stdin); ^ main.cpp:7:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("qmatrix.out","w",stdout); ^ main.cpp:9:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d\n",&N,&x,&y,&Q); ^ main.cpp:25:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c %d %d\n",&c,&k,&p); ^