Compilare: user.cpp: In function ‘int main()’: user.cpp:88:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbkset.in", "r", stdin); ^ user.cpp:89:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbkset.out", "w", stdout); ^ user.cpp: In function ‘void sol()’: user.cpp:55:102: warning: ‘add’ may be used uninitialized in this function [-Wmaybe-uninitialized] int add1 = (d[0][p[i]][pc1] - d[0][p[i]][pc1 - 1]), add2 = (add - calc(j, i, pc2 - 1)); ^