Compilare: main.cpp: In function 'int solve(int)': main.cpp:31:13: warning: unused variable 'ans' [-Wunused-variable] int ans = 1,cnt = 0; ^~~ main.cpp: In function 'int main()': main.cpp:116:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d %d",&t,&n,&m,&k); ^ main.cpp:126:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&v[i][j]); ^