Compilare: user.cpp: In function ‘void input()’: user.cpp:104:9: warning: unused variable ‘e’ [-Wunused-variable] int e, i, x, y; ^ user.cpp:104:15: warning: unused variable ‘x’ [-Wunused-variable] int e, i, x, y; ^ user.cpp:104:18: warning: unused variable ‘y’ [-Wunused-variable] int e, i, x, y; ^ user.cpp: In function ‘int main()’: user.cpp:16:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("senat.in", "r", stdin); ^ user.cpp:17:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("senat.out", "w", stdout); ^ user.cpp: In function ‘void input()’: user.cpp:106:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &na, &n); ^ user.cpp:111:30: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 1000, stdin); ^