Compilare: main.cpp: In function 'int main()': main.cpp:108:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xor.in", "r", stdin); ^ main.cpp:109:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xor.out", "w", stdout); ^ main.cpp:113:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &test, &mod); ^ main.cpp:117:54: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld%lld", &l1, &c1, &l2, &c2); ^ main.cpp: In function 'void process()': main.cpp:48:34: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized] for(int j = i + 1; j <= pos; j++) { ~~^~~~~~