Compilare: user.cpp: In function ‘int main()’: user.cpp:41:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxsubsum.in", "r", stdin); ^ user.cpp:42:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxsubsum.out", "w", stdout); ^ user.cpp:63:15: warning: ‘len2’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol = sol * len2 + sol2 * len; ^ user.cpp:63:29: warning: ‘len’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol = sol * len2 + sol2 * len; ^