Compilare: main.cpp: In function 'int main()': main.cpp:12:9: warning: unused variable 'x1' [-Wunused-variable] int x1,x2,y1,y2,val; ^~ main.cpp:12:12: warning: unused variable 'x2' [-Wunused-variable] int x1,x2,y1,y2,val; ^~ main.cpp:12:15: warning: unused variable 'y1' [-Wunused-variable] int x1,x2,y1,y2,val; ^~ main.cpp:12:18: warning: unused variable 'y2' [-Wunused-variable] int x1,x2,y1,y2,val; ^~ main.cpp:12:21: warning: unused variable 'val' [-Wunused-variable] int x1,x2,y1,y2,val; ^~~ main.cpp:14:15: warning: unused variable 'sum1' [-Wunused-variable] long long sum1=0; ^~~~ main.cpp:9:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tablou.in","r",stdin); ^ main.cpp:10:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tablou.out","w",stdout); ^ main.cpp:15:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ main.cpp:19:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%1d",&mat[i][j]); ^ main.cpp:40:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ main.cpp:44:53: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d",&x1,&y1,&x2,&y2,&val); ^