Compilare: user.cpp: In function ‘int BFS(std::pair<int, int>)’: user.cpp:36:18: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] if(I < 1 | I > L | J < 1 | J > C | visited[I][J]) ^ user.cpp:36:34: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] if(I < 1 | I > L | J < 1 | J > C | visited[I][J]) ^ user.cpp:36:42: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] if(I < 1 | I > L | J < 1 | J > C | visited[I][J]) ^ user.cpp:46:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:50:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kdrum.in", "r", stdin); ^ user.cpp:51:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kdrum.out", "w", stdout); ^ user.cpp:55:66: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d %d %d", &L, &C, &K, &x1, &y1, &x2, &y2); ^ user.cpp:61:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &park[i][j]); ^