Compilare: main.cpp: In function 'int mysqrt(int)': main.cpp:82:10: warning: statement has no effect [-Wunused-value] for(i;i*i<=val;++i); ^ main.cpp: In function 'int main()': main.cpp:92:10: warning: statement has no effect [-Wunused-value] for(t;t;--t){ ^ main.cpp:88:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ct.in","r",stdin); ^ main.cpp:89:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ct.out","w",stdout); ^ main.cpp:91:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ main.cpp:93:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n,&k); ^ main.cpp:96:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x,&y); ^ main.cpp:103:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x,&y); ^