Compilare: user.cpp: In function ‘int main()’: user.cpp:34:19: warning: statement has no effect [-Wunused-value] for(j1;j1<=l[i1];++j1){ ^ user.cpp:38:19: warning: statement has no effect [-Wunused-value] for(j2;j2<=l[i2];++j2){ ^ user.cpp:53:19: warning: statement has no effect [-Wunused-value] for(j1;j1<=l[i1]&&NR<L;++j1) ^ user.cpp:55:19: warning: statement has no effect [-Wunused-value] for(j2;j2<=l[i2]&&NR<L;++j2) ^ user.cpp:15:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qvect.in", "r", stdin); ^ user.cpp:16:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qvect.out", "w", stdout); ^ user.cpp:17:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &q); ^ user.cpp:19:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &l[i]); ^ user.cpp:21:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^ user.cpp:24:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &caz,&i1,&i2); ^