Compilare: main.cpp: In function 'int main()': main.cpp:16:48: warning: unused variable 'xm' [-Wunused-variable] int i , j , i1 , j1 , s , s1 , r , c , x , xm , ym , xm1, ym1 , sm; ^~ main.cpp:16:53: warning: unused variable 'ym' [-Wunused-variable] int i , j , i1 , j1 , s , s1 , r , c , x , xm , ym , xm1, ym1 , sm; ^~ main.cpp:16:58: warning: unused variable 'xm1' [-Wunused-variable] int i , j , i1 , j1 , s , s1 , r , c , x , xm , ym , xm1, ym1 , sm; ^~~ main.cpp:16:64: warning: unused variable 'ym1' [-Wunused-variable] int i , j , i1 , j1 , s , s1 , r , c , x , xm , ym , xm1, ym1 , sm; ^~~ main.cpp:16:70: warning: unused variable 'sm' [-Wunused-variable] int i , j , i1 , j1 , s , s1 , r , c , x , xm , ym , xm1, ym1 , sm; ^~ main.cpp:14:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("balans.in" , "r" , stdin); ^ main.cpp:15:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("balans.out" , "w" , stdout); ^ main.cpp:18:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d" , &n , &m , &r , &c); ^ main.cpp:22:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &a[i][j]); ^