Compilare: main.cpp: In function 'int queryAIB(int)': main.cpp:74:7: warning: unused variable 'ans' [-Wunused-variable] int ans, i, step; ^~~ main.cpp: In function 'int main()': main.cpp:88:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("diez.in", "r", stdin); ^ main.cpp:89:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("diez.out", "w", stdout); ^ main.cpp:91:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d\n", &n, &m); ^ main.cpp:92:22: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets (s, n, stdin); ^ main.cpp:94:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &O [i].type); ^ main.cpp:96:54: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%c%c\n", &O [i].p, &blank, &O [i].ch); ^ main.cpp:100:57: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d\n", &O [i].q1, &O [i].q2, &O [i].p); ^