Compilare: user.cpp: In function ‘int main()’: user.cpp:72:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortnet.in", "r", stdin); ^ user.cpp:73:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortnet.out", "w", stdout); ^ user.cpp:75:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &n, &m); ^ user.cpp:80:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("<%d,%d> ", &x, &y); ^ user.cpp: In function ‘bool solve(int, int)’: user.cpp:59:19: warning: ‘where’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((where < bit && c1) || (where > bit && c2)) bit = where; ^ user.cpp:59:25: warning: ‘c1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((where < bit && c1) || (where > bit && c2)) bit = where; ^ user.cpp:59:48: warning: ‘c2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((where < bit && c1) || (where > bit && c2)) bit = where; ^