Compilare: user.cpp: In function ‘int main()’: user.cpp:33:9: warning: unused variable ‘t’ [-Wunused-variable] int t=0, i, j, i1, j1,s=0; ^ user.cpp:33:14: warning: unused variable ‘i’ [-Wunused-variable] int t=0, i, j, i1, j1,s=0; ^ user.cpp:33:17: warning: unused variable ‘j’ [-Wunused-variable] int t=0, i, j, i1, j1,s=0; ^ user.cpp:33:20: warning: unused variable ‘i1’ [-Wunused-variable] int t=0, i, j, i1, j1,s=0; ^ user.cpp:33:24: warning: unused variable ‘j1’ [-Wunused-variable] int t=0, i, j, i1, j1,s=0; ^ user.cpp:10:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("delfin.in", "r", stdin); ^ user.cpp:11:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("delfin.out", "w", stdout); ^ user.cpp:12:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &m); ^ user.cpp:16:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &a[i][j]); ^