Compilare: main.cpp: In function 'void show()': main.cpp:93:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<n*4;i++){ ~^~~~ main.cpp:96:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<n*4;i++){ ~^~~~ main.cpp: In function 'int main()': main.cpp:102:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxq.in", "r", stdin); ^ main.cpp:103:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxq.out", "w", stdout); ^ main.cpp:105:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%u", &n); ^ main.cpp:107:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &v[i]); ^ main.cpp:113:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%u", &m); ^ main.cpp:115:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%u %u %u", &op, &x, &y); ^