Compilare: main.cpp: In function 'void solve(int, int, int, int)': main.cpp:13:9: warning: unused variable 'w' [-Wunused-variable] int w, cnt = 0; ^ main.cpp: In function 'int main()': main.cpp:23:11: warning: unused variable 'fin' [-Wunused-variable] FILE *fin = freopen("qxy.in","r",stdin); ^~~ main.cpp:26:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:28:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^ main.cpp:32:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&Q); ^ main.cpp:34:41: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&i,&j,&x,&y); ^