Compilare: user.cpp: In function ‘void read()’: user.cpp:8:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("placare.in", "r", stdin); ^ user.cpp:9:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("placare.out", "w", stdout); ^ user.cpp:10:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp: In function ‘void solve()’: user.cpp:24:23: warning: array subscript is above array bounds [-Warray-bounds] -- b[2][p]; ^ user.cpp:24:23: warning: array subscript is above array bounds [-Warray-bounds] user.cpp:21:33: warning: array subscript is above array bounds [-Warray-bounds] while (p <= m && b[2][p]) ^ user.cpp:32:20: warning: array subscript is above array bounds [-Warray-bounds] b[2][p] = -x - 1; ^ user.cpp:40:24: warning: array subscript is above array bounds [-Warray-bounds] b[2][j] = 0; ^