Compilare: main.cpp: In function 'int main()': main.cpp:49:16: warning: variable 'a1' set but not used [-Wunused-but-set-variable] ld a1, a2, b1, b2; ^~ main.cpp:49:20: warning: variable 'a2' set but not used [-Wunused-but-set-variable] ld a1, a2, b1, b2; ^~ main.cpp:49:28: warning: variable 'b2' set but not used [-Wunused-but-set-variable] ld a1, a2, b1, b2; ^~ main.cpp:18:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("obstacole.in", "r", stdin); ^ main.cpp:19:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("obstacole.out", "w", stdout); ^ main.cpp:54:23: warning: 'b1' may be used uninitialized in this function [-Wmaybe-uninitialized] ld d = b1 + min (a[j].x1, a[j].x2) - x; ~~~^~~~~~~~~~~~~~~~~~~~~~~~