Compilare: user.cpp: In function ‘int main()’: user.cpp:36:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp:38:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &a[i]); ^ user.cpp:41:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &e[i], &val[i]); ^ user.cpp:23:5: warning: ‘t’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(p=0; p<t; p++){ ^ user.cpp:13:19: note: ‘t’ was declared here int r=ans, p, t; ^ user.cpp:23:5: warning: ‘t’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(p=0; p<t; p++){ ^ user.cpp:13:19: note: ‘t’ was declared here int r=ans, p, t; ^