Compilare: main.cpp: In function 'int main()': main.cpp:192:7: warning: variable 'wx' set but not used [-Wunused-but-set-variable] int wx, wy; ^~ main.cpp:192:11: warning: variable 'wy' set but not used [-Wunused-but-set-variable] int wx, wy; ^~ main.cpp:136:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d %d", &n, &m); ^ main.cpp:137:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d %d", &v, &u); ^ main.cpp:140:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d", &a[i][j]); ^