Compilare: main.cpp: In function 'int main()': main.cpp:73:17: warning: unused variable 'k' [-Wunused-variable] int i , j , k , xs , ys , ds , xf , yf , minim; ^ main.cpp:71:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("semafoare.in" , "r" , stdin); ^ main.cpp:72:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("semafoare.out" , "w" , stdout); ^ main.cpp:75:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d " , &n , &m , &xs , &ys); ^ main.cpp:76:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c" , &ch); ^ main.cpp:77:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n" , &xf , &yf); ^