Compilare: user.cpp:7:53: warning: integer overflow in expression [-Woverflow] int distance[50001], visited[50001], OO = (1 << 31) - 1; ^ user.cpp: In function ‘void read(int&)’: user.cpp:74:23: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] while(buffer[pos] < 48 | buffer[pos] > 57) ^ user.cpp:85:23: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(buffer[pos] > 47 & buffer[pos] < 58) ^ user.cpp: In function ‘int main()’: user.cpp:120:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.in", "r", stdin); ^ user.cpp:121:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.out", "w", stdout); ^ user.cpp: In function ‘void read(int&)’: user.cpp:80:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, bufferSize, stdin); ^ user.cpp:91:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, bufferSize, stdin); ^