Compilare: main.cpp: In function 'I k(I, I)': main.cpp:4:229: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] 4 | using I=int;using namespace std;ifstream f("concurs.in");ofstream g("concurs.out");const I h=4e4;I p[h],a[h],b[h],t[h][16],n,m,x,y,r,c,d,q,s,u,i=0,j=0;set<I>e[h];void z(I x){a[x]=++d;W(I y:e[x])z(y);b[x]=++d;}I k(I x,I y){L a[x]<=a[y]&b[y]<=b[x];}I o(I x,I y){if(k(x,y))L x;if(k(y,x))L y;W(i=15;i-->=0;)if(!k(t[x][i],y))x=t[x][i];L t[x][0];}main(){f>>n>>m;W(;++i<=n;)f>>p[i];W(i=n;--i>0;)f>>x>>y,t[y][0]=x,e[x].insert(y);W(;++i<=n;i)r|=!t[i][0]*i;W(;++j<16;)W(i=0;++i<=n;){I&G=t[i][j];G=t[t[i][j-1]][j-1],G|=!G*r;}z(r);W(;m--;){f>>x>>y;c=p[o(x,y)];if(q<=c&x<=s&y<u)q=c,s=x,u=y;}g<<q<<' '<<s<<' '<<u;} | ~~~~^~~~~~ main.cpp: At global scope: main.cpp:4:342: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 4 | using I=int;using namespace std;ifstream f("concurs.in");ofstream g("concurs.out");const I h=4e4;I p[h],a[h],b[h],t[h][16],n,m,x,y,r,c,d,q,s,u,i=0,j=0;set<I>e[h];void z(I x){a[x]=++d;W(I y:e[x])z(y);b[x]=++d;}I k(I x,I y){L a[x]<=a[y]&b[y]<=b[x];}I o(I x,I y){if(k(x,y))L x;if(k(y,x))L y;W(i=15;i-->=0;)if(!k(t[x][i],y))x=t[x][i];L t[x][0];}main(){f>>n>>m;W(;++i<=n;)f>>p[i];W(i=n;--i>0;)f>>x>>y,t[y][0]=x,e[x].insert(y);W(;++i<=n;i)r|=!t[i][0]*i;W(;++j<16;)W(i=0;++i<=n;){I&G=t[i][j];G=t[t[i][j-1]][j-1],G|=!G*r;}z(r);W(;m--;){f>>x>>y;c=p[o(x,y)];if(q<=c&x<=s&y<u)q=c,s=x,u=y;}g<<q<<' '<<s<<' '<<u;} | ^~~~ main.cpp: In function 'int main()': main.cpp:4:432: warning: for increment expression has no effect [-Wunused-value] 4 | using I=int;using namespace std;ifstream f("concurs.in");ofstream g("concurs.out");const I h=4e4;I p[h],a[h],b[h],t[h][16],n,m,x,y,r,c,d,q,s,u,i=0,j=0;set<I>e[h];void z(I x){a[x]=++d;W(I y:e[x])z(y);b[x]=++d;}I k(I x,I y){L a[x]<=a[y]&b[y]<=b[x];}I o(I x,I y){if(k(x,y))L x;if(k(y,x))L y;W(i=15;i-->=0;)if(!k(t[x][i],y))x=t[x][i];L t[x][0];}main(){f>>n>>m;W(;++i<=n;)f>>p[i];W(i=n;--i>0;)f>>x>>y,t[y][0]=x,e[x].insert(y);W(;++i<=n;i)r|=!t[i][0]*i;W(;++j<16;)W(i=0;++i<=n;){I&G=t[i][j];G=t[t[i][j-1]][j-1],G|=!G*r;}z(r);W(;m--;){f>>x>>y;c=p[o(x,y)];if(q<=c&x<=s&y<u)q=c,s=x,u=y;}g<<q<<' '<<s<<' '<<u;} | ^ main.cpp:4:553: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] 4 | using I=int;using namespace std;ifstream f("concurs.in");ofstream g("concurs.out");const I h=4e4;I p[h],a[h],b[h],t[h][16],n,m,x,y,r,c,d,q,s,u,i=0,j=0;set<I>e[h];void z(I x){a[x]=++d;W(I y:e[x])z(y);b[x]=++d;}I k(I x,I y){L a[x]<=a[y]&b[y]<=b[x];}I o(I x,I y){if(k(x,y))L x;if(k(y,x))L y;W(i=15;i-->=0;)if(!k(t[x][i],y))x=t[x][i];L t[x][0];}main(){f>>n>>m;W(;++i<=n;)f>>p[i];W(i=n;--i>0;)f>>x>>y,t[y][0]=x,e[x].insert(y);W(;++i<=n;i)r|=!t[i][0]*i;W(;++j<16;)W(i=0;++i<=n;){I&G=t[i][j];G=t[t[i][j-1]][j-1],G|=!G*r;}z(r);W(;m--;){f>>x>>y;c=p[o(x,y)];if(q<=c&x<=s&y<u)q=c,s=x,u=y;}g<<q<<' '<<s<<' '<<u;} | ~^~~ main.cpp:4:563: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] 4 | using I=int;using namespace std;ifstream f("concurs.in");ofstream g("concurs.out");const I h=4e4;I p[h],a[h],b[h],t[h][16],n,m,x,y,r,c,d,q,s,u,i=0,j=0;set<I>e[h];void z(I x){a[x]=++d;W(I y:e[x])z(y);b[x]=++d;}I k(I x,I y){L a[x]<=a[y]&b[y]<=b[x];}I o(I x,I y){if(k(x,y))L x;if(k(y,x))L y;W(i=15;i-->=0;)if(!k(t[x][i],y))x=t[x][i];L t[x][0];}main(){f>>n>>m;W(;++i<=n;)f>>p[i];W(i=n;--i>0;)f>>x>>y,t[y][0]=x,e[x].insert(y);W(;++i<=n;i)r|=!t[i][0]*i;W(;++j<16;)W(i=0;++i<=n;){I&G=t[i][j];G=t[t[i][j-1]][j-1],G|=!G*r;}z(r);W(;m--;){f>>x>>y;c=p[o(x,y)];if(q<=c&x<=s&y<u)q=c,s=x,u=y;}g<<q<<' '<<s<<' '<<u;} | ~^~