Compilare: main.cpp: In function 'int calc(int, int, int, int)': main.cpp:11:7: warning: unused variable 'x3' [-Wunused-variable] int i,x3,y3,x4,y4,maxim=0; ^~ main.cpp:11:10: warning: unused variable 'y3' [-Wunused-variable] int i,x3,y3,x4,y4,maxim=0; ^~ main.cpp:11:13: warning: unused variable 'x4' [-Wunused-variable] int i,x3,y3,x4,y4,maxim=0; ^~ main.cpp:11:16: warning: unused variable 'y4' [-Wunused-variable] int i,x3,y3,x4,y4,maxim=0; ^~ main.cpp: In function 'int main()': main.cpp:49:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("colorfulconflict.in","r",stdin); ^ main.cpp:50:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("colorfulconflict.out","w",stdout); ^ main.cpp:52:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:55:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i][j]),maxim=max(maxim,v[i][j]); ^