Compilare: main.cpp: In function 'int main()': main.cpp:35:33: warning: unused variable 'tx' [-Wunused-variable] int i, n, m, op_type, x, y, tx, ty; ^~ main.cpp:35:37: warning: unused variable 'ty' [-Wunused-variable] int i, n, m, op_type, x, y, tx, ty; ^~ main.cpp:33:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.in","r",stdin); ^ main.cpp:34:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.out","w", stdout); ^ main.cpp:36:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:44:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &op_type, &x, &y); ^