Compilare: user.cpp: In function ‘int cate(int, int)’: user.cpp:37:30: warning: variable ‘last’ set but not used [-Wunused-but-set-variable] int l1=1, l2=v[a][0], mij, last=1000000001, stop=0, found; ^ user.cpp: In function ‘int query2(int, int)’: user.cpp:63:34: warning: unused variable ‘last’ [-Wunused-variable] int l1, l2, mij=MAXK*MAXN+1, last, sm=0, s, found, i, smm=0; ^ user.cpp: In function ‘int main()’: user.cpp:91:36: 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:92:38: 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:94:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &q); ^ user.cpp:97:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &k); ^ user.cpp:101:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i][j]); ^ user.cpp:108:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &tq, &a, &b); ^ user.cpp:74:35: warning: ‘found’ may be used uninitialized in this function [-Wmaybe-uninitialized] smm=smm+cate(i, mij+1); ^ user.cpp:37:55: note: ‘found’ was declared here int l1=1, l2=v[a][0], mij, last=1000000001, stop=0, found; ^ user.cpp:73:31: warning: ‘found’ may be used uninitialized in this function [-Wmaybe-uninitialized] sm=sm+cate(i, mij); ^ user.cpp:37:55: note: ‘found’ was declared here int l1=1, l2=v[a][0], mij, last=1000000001, stop=0, found; ^