Compilare: user.cpp: In function ‘int compx(obstacol, obstacol)’: user.cpp:27:25: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(a.x>b.x || a.x==b.x && a.y>b.y) ^ user.cpp: In function ‘int compy(obstacol, obstacol)’: user.cpp:34:25: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(a.y>b.y || a.y==b.y && a.x>b.x) ^ user.cpp: In function ‘int main()’: user.cpp:114:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ai.in", "r", stdin); ^ user.cpp:115:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ai.out", "w", stdout); ^ user.cpp:117:111: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n%d %d %d %d %d %d %d %d %d %d\n%d\n", &n, &t1, &t2, &s1, &s2, &s3, &s4, &r1, &r2, &r3, &r4, &m); ^ user.cpp:121:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &obs[i].x, &obs[i].y); ^